Classical Cutting Technique

Brunoise

Q: What is the difference between brunoise and fine brunoise?

Brunoise: 3 x 3 x 3 mm. Fine brunoise (brunoise fine): 1.5 x 1.5 x 1.5 mm. Both are standardised in CIA Professional Chef (9th edition, Wiley, 2011) and date back to Auguste Escoffier's Le Guide Culinaire (1903). Fine brunoise is 8 times smaller in volume than standard brunoise: it requires twice as sharp knives and twice the concentration.

Q: How do I prevent brunoise from discolouring (browning)?

Browning on cut vegetables is caused by polyphenol oxidase enzymes that react with polyphenols upon contact with air (Harold McGee, On Food and Cooking, 2004). Solutions: (1) store immediately in cold water with lemon juice, (2) cover with damp paper towels, (3) blanch briefly after cutting (enzymes are inactivated above 80°C). Tomato: remove seeds for less moist brunoise.

Q: Which knife is best for brunoise?

A chef's knife of 20-25 cm with a thin, sharp blade. A Japanese santoku knife (180mm) is popular for fine cuts due to its thin cutting edge and lighter weight. The knife must be sharp enough to cut through a tomato under its own weight, without pressure. A dull knife = messy brunoise + increased cutting risk. (Jacques Pepin, La Technique, Pocket Books, 1976)

Q: When do I use brunoise versus mirepoix?

Mirepoix is the name of the flavour base (onion + carrot + celery in a 2:1:1 ratio), brunoise is the cutting shape. Mirepoix can be cut in various styles: rough chopped for slow stocks, brunoise for fine soups and sauces, julienne for quick preparations. Fine brunoise is used where the vegetable remains visible as garnish (consomme, aspic). (CIA Professional Chef, 2011)

Q: Why is squaring (parer) mandatory for brunoise?

Squaring: cutting all six sides straight, is mandatory because an irregular exterior results in uneven slabs, uneven julienne and therefore uneven brunoise. Even a 0.5 mm deviation in the first slab produces cubes that lower the quality of the rest of the dish in fine brunoise. All trimmings go to stock: there is no waste.

Q: How fast should a professional cook be able to cut brunoise?

Professional standard: one medium carrot (approx. 150 g) in standard brunoise in under 45 seconds, including squaring. This produces approximately 80-100 cubes of 3 mm. Fine brunoise takes 2-3 times as long. Jacques Pepin demonstrates the complete brunoise of a carrot in 38 seconds in La Technique (1976). Train daily for 10-15 minutes for speed and consistency.

Brunoise is the most refined cube cut in classical French cuisine: 3 mm x 3 mm x 3 mm for standard, 1.5 mm x 1.5 mm x 1.5 mm for fine brunoise. Codified by Auguste Escoffier in Le Guide Culinaire (1903) and standardised by the CIA in The Professional Chef. Mirepoix, consomme garnish, vinaigrettes: brunoise is the measure of precision.

3 mm standard brunoise: 3x3x3 mm cube (CIA Professional Chef, 9th ed. 2011)

1.5 mm fine brunoise for consomme garnish and delicate sauces (Escoffier, 1903)

4 steps squaring, slicing, julienne, brunoise (Jacques Pepin, La Technique, 1976)

<45 sec professional standard: brunoise of one medium carrot (approx. 80 cubes)

Requirements

Chef's knife 20-25 cm, sharply honed (cutting should require no force) Green cutting board (NVWA colour code: vegetables and fruit) Set square or garnishing ruler for 3 mm calibration during training Straight, firm vegetables: carrot, celery, onion, celeriac Lemon juice or cold water (oxidation prevention on cut surfaces)

In brief

[DEFINITION] Brunoise

Brunoise is a French cutting technique in which a vegetable or other ingredient is cut into exact cubes of 3 mm x 3 mm x 3 mm. Fine brunoise (brunoise fine) measures 1.5 mm x 1.5 mm x 1.5 mm. The technique always follows four steps: peeling and squaring (parer), cutting slabs (planking), cutting julienne, and transversely dicing. Standardised in Auguste Escoffier, Le Guide Culinaire (Flammarion, 1903) and modernised in CIA The Professional Chef (9th edition, Wiley, 2011).

Standard brunoise: 3 mm x 3 mm x 3 mm. Application: mirepoix for stocks and soups, vinaigrettes, dressings, sauce bases. The most commonly used cube cut in the professional kitchen. (CIA Professional Chef, 9th edition, Wiley, 2011)
Fine brunoise (brunoise fine): 1.5 mm x 1.5 mm x 1.5 mm. Application: garnish for consomme, aspic, fine tartare sauces, carpaccio dressings. Requires an exceptionally sharp knife and consistent hand movement. (Auguste Escoffier, Le Guide Culinaire, Flammarion, 1903)
The technique always consists of four steps: (1) squaring (parer): cutting all six sides straight to create a perfect rectangular block, (2) planking: cutting even slabs of the desired thickness, (3) julienne: stacking slabs and cutting into strips, (4) brunoise: transversely dicing the strips into cubes. (Jacques Pepin, La Technique, Pocket Books, 1976)
Oxidation prevention: cut vegetables with high polyphenol content (potato, carrot, parsnip) oxidise quickly on the surface. Store brunoise immediately in cold water with a few drops of lemon juice, or cover with damp paper towels. Harold McGee, On Food and Cooking (Scribner, 2004) describes enzymatic browning as a reaction between polyphenol oxidase and polyphenols upon exposure to air.

The classical cube cut dimensions

Fine brunoise — 1.5 mm cubed

Smallest cube cut. Consomme garnish, aspic, fine tartare sauces. Requires a perfectly sharp knife and consistent technique. Not for beginners.

Examples: Carrot, truffle, chives, sorrel in consomme

Brunoise — 3 mm cubed

Standard cube cut of the professional kitchen. Mirepoix, vinaigrettes, sauce bases. The first cut students learn and the last they master.

Examples: Mirepoix (onion/carrot/celery), dressings, tomato

Small dice — 6 mm cubed

Double brunoise. Soups, minestrone, stews. Less time-intensive, even cooking guaranteed.

Examples: Vegetable soup, casseroles, pasta sauces

Medium/Large dice — 12-20 mm cubed

Larger cubes for roasting, gratins and rustic soups. Technically part of the brunoise family, but the precision requirement is lower than for 3 mm.

Examples: Oven dishes, potato pieces, rough-cut vegetables

Sources: CIA Professional Chef, 9th ed. (Wiley, 2011); Auguste Escoffier, Le Guide Culinaire (1903); Jacques Pepin, La Technique (1976)

Applications by vegetable

Carrot

Most commonly used brunoise vegetable. Firm structure, cuts evenly, holds shape after cooking. Standard mirepoix component. Store in cold water after cutting (oxidation prevention).

Firmness: medium Mirepoix: yes

Onion

Second mirepoix component. Layered structure requires adaptation: cut from root end towards tip (not transversely) for even cubes. Prevent tears: sharp knife, look away, use a cold onion.

Method: horizontal+vertical Mirepoix: yes

Celery

Third mirepoix component. First remove strings (thin fibres along the stalk). Trim the curved side flat for a stable base. Flavour stronger than carrot or onion: add less per volume.

Remove strings: yes Mirepoix: yes

Celeriac

Excellent for fine brunoise in soups. Oxidises rapidly: place in lemon water immediately. Hard texture requires firm cutting; the knife must be sharp. Earthy, intense flavour.

Oxidation: rapid Fix: immediately in lemon water

Tomato (peeled)

First peel: score a cross, 10 seconds in boiling water, ice bath. Then remove seeds. Then cut brunoise. Tomate concassee = rough variant; brunoise = fine variant for sauces.

Step 1: peel+seed Name: tomate mondee

Lemon zest (zeste)

Fine brunoise of lemon peel (without pith): zeste d'agrumes brunoise. First remove the yellow outer peel with a vegetable peeler, then brunoise. No pith (albedo): extremely bitter. Used in sauces, creams, garnishes.

No pith Name: zeste brunoise

Step-by-step method

1

Peel and square (parer)

Peel the vegetable. Cut all six sides straight to create a perfect rectangular block (parer). This is not waste: all trimmings go to stock or broth. Without straight surfaces, an even brunoise is impossible.

Save trimmings: carrot and onion parings form the foundation of every stock. Brunoise trimming waste is free stock material.
2

Cut slabs (3 mm thick)

Cut the squared block into even slabs of 3 mm thickness for standard brunoise (1.5 mm for fine brunoise). Use the knuckle of your free hand as a guide. Let the flat of the blade ride along the knuckle, fingers curled: the chef's grip.
3

Stack slabs and cut julienne

Stack 3-4 slabs on top of each other. Cut again into 3 mm wide strips (julienne). Keep the stack stable with the free hand. The result: long rectangular sticks with a 3 x 3 mm cross-section. (Jacques Pepin, La Technique, Pocket Books, 1976)
4

Dice julienne transversely into brunoise

Gather the julienne strips bundled together. Dice transversely at 3 mm intervals: this produces the 3 x 3 x 3 mm cubes. Use an even, rhythmic chopping motion. Not "slicing" but "chopping" with the front part of the knife.
5

Fine brunoise: repeat at 1.5 mm

For fine brunoise, repeat steps 2-4 with 1.5 mm spacing. This requires an exceptionally sharp knife and a stable hand position. Train first on large vegetables (carrot, celeriac) before cutting fine brunoise of delicate products.
6

Store and prevent oxidation

Store cut brunoise in cold water for vegetables that oxidise quickly (carrot, celeriac, potato). Or cover with damp paper towels. Use within 2 hours of cutting for maximum texture and colour. Harold McGee (2004): polyphenol oxidase is responsible for browning on cut surfaces.

HACCP: thoroughly clean the cutting board after use. Cut surfaces are ideal breeding grounds for bacteria (Listeria, Salmonella). During continuous use, clean every 30 minutes.

HACCP: Cutting surfaces and colour-coding system

NVWA colour-coding system: the most effective measure

NVWA colour-coding system for cutting boards: red = raw beef and pork, yellow = raw poultry, green = fresh vegetables and fruit, white = bread and cheese, blue = raw fish, brown = cooked meat. Always use the correct colour for the correct product category. (NVWA, 2022)
Brunoise cutting of vegetables always on the green cutting board. This is not a choice but a HACCP obligation in professional kitchens (EU Regulation 852/2004).
Cutting boards after use: hot soapy water, rinse, disinfect, dry. Never leave wet: damp cutting boards are ideal breeding grounds for Listeria monocytogenes.

Source: NVWA — Colour-coding system professional kitchen (2022); EU Regulation 852/2004

Cutting surfaces and bacterial growth: the invisible risk

Every cutting motion creates microscopic grooves in the cutting board. Micro-organisms nestle into these grooves and are not removed by simply wiping. Regular disinfection is mandatory.
Brunoise of mixed products (onion + carrot + celery) on one cutting board: clean between products if any product poses an allergen risk. For example: celery is a mandatory allergen (EU 1169/2011).
Keeping knives sharp is a HACCP measure: a dull knife requires more pressure, increases the risk of slipping and damages the product, releasing more cell sap: a breeding ground for bacteria on the cutting surface.

Source: EU Regulation 852/2004 Annex II Chapter V; NVWA — Personal hygiene and equipment hygiene (2022)

Classical cube cut dimensions (CIA 2011 + Escoffier 1903)

Name	Dimension	Application
Fine brunoise	1.5 x 1.5 x 1.5 mm	Consomme garnish, aspic, fine sauces
Brunoise	3 x 3 x 3 mm	Mirepoix, vinaigrettes, sauce bases
Small dice	6 x 6 x 6 mm	Soups, minestrone, stews
Medium dice	12 x 12 x 12 mm	Roasted vegetables, gratins, oven dishes
Large dice	20 x 20 x 20 mm	Rustic stews, potato preparations
Julienne	3 x 3 x 60 mm	Garnish, salad, julienne soup
Batonnet	6 x 6 x 60 mm	Vegetable sticks, fries, crudites

Source: CIA Professional Chef (Wiley, 9th edition, 2011); Auguste Escoffier, Le Guide Culinaire (Flammarion, 1903)

Food cost: utilising trimmings, nothing goes to waste

Trimming waste to stock: Squaring vegetables for brunoise produces trimmings of carrot, celery and onion. This is exactly the mirepoix base for every vegetable or meat stock. Save all trimmings in a container in the refrigerator: stock cost = zero in raw materials.
Mirepoix as value creator: A brunoise of 200g carrot/onion/celery costs approximately €0.40 in ingredients. As a sauce base for 10 portions of a main course, this mirepoix represents €0.04 per portion in food cost for a component that improves the flavour depth of the dish by 40-60%.
Fine brunoise as premium garnish: Fine brunoise of truffle, carrot or zest over a consomme or sauce. Even 10 grams of fine brunoise truffle per portion delivers a spectacular visual presentation. Cost: €0.50-1.50 per portion. Sales value: premium positioning of the dish.
Time investment vs. value: Cutting brunoise takes time. An experienced cook processes one kilo of carrot brunoise in 25-30 minutes. Factor in the time cost (cook's salary) when calculating your recipe cost. Consider a food processor with a brunoise attachment for large volumes: CIA Knife Skills (2007) indicates that cutting machines offer a cost advantage for volumes above 2 kg.

Frequently asked questions

What is the difference between brunoise and fine brunoise?

Brunoise: 3 x 3 x 3 mm. Fine brunoise (brunoise fine): 1.5 x 1.5 x 1.5 mm. Both are standardised in CIA Professional Chef (9th edition, Wiley, 2011) and date back to Auguste Escoffier's Le Guide Culinaire (1903). Fine brunoise is 8 times smaller in volume than standard brunoise: it requires twice as sharp knives and twice the concentration.

How do I prevent brunoise from discolouring (browning)?

Browning on cut vegetables is caused by polyphenol oxidase enzymes that react with polyphenols upon contact with air (Harold McGee, On Food and Cooking, 2004). Solutions: (1) store immediately in cold water with lemon juice, (2) cover with damp paper towels, (3) blanch briefly after cutting (enzymes are inactivated above 80°C). Tomato: remove seeds for less moist brunoise.

Which knife is best for brunoise?

A chef's knife of 20-25 cm with a thin, sharp blade. A Japanese santoku knife (180mm) is popular for fine cuts due to its thin cutting edge and lighter weight. The knife must be sharp enough to cut through a tomato under its own weight, without pressure. A dull knife = messy brunoise + increased cutting risk. (Jacques Pepin, La Technique, Pocket Books, 1976)

When do I use brunoise versus mirepoix?

Mirepoix is the name of the flavour base (onion + carrot + celery in a 2:1:1 ratio), brunoise is the cutting shape. Mirepoix can be cut in various styles: rough chopped for slow stocks, brunoise for fine soups and sauces, julienne for quick preparations. Fine brunoise is used where the vegetable remains visible as garnish (consomme, aspic). (CIA Professional Chef, 2011)

Why is squaring (parer) mandatory for brunoise?

Squaring: cutting all six sides straight, is mandatory because an irregular exterior results in uneven slabs, uneven julienne and therefore uneven brunoise. Even a 0.5 mm deviation in the first slab produces cubes that lower the quality of the rest of the dish in fine brunoise. All trimmings go to stock: there is no waste.

How fast should a professional cook be able to cut brunoise?

Professional standard: one medium carrot (approx. 150 g) in standard brunoise in under 45 seconds, including squaring. This produces approximately 80-100 cubes of 3 mm. Fine brunoise takes 2-3 times as long. Jacques Pepin demonstrates the complete brunoise of a carrot in 38 seconds in La Technique (1976). Train daily for 10-15 minutes for speed and consistency.

Legal information & disclaimer — click to read

Informational disclaimer

The information on this page is intended solely for educational and informational purposes for hospitality professionals. KitchenNmbrs B.V. strives for accuracy and timeliness but cannot guarantee that all information is fully correct, complete or up-to-date at all times. Culinary techniques, scientific insights and food safety guidelines may change.

Professional responsibility

Applying the techniques described requires professional expertise and training. KitchenNmbrs is not liable for damage, injury, illness or loss resulting from the application of information from this website without adequate professional guidance or verification. Every kitchen, every product and every environment is different: always apply your own professional judgement.

Food safety & HACCP

The HACCP guidelines, temperatures and storage advice on this page are based on Codex Alimentarius (WHO/FAO) as the global baseline standard and EU Regulation 852/2004. Local laws and regulations may differ. Always consult your national food safety authority for the applicable standards in your region:

Netherlands: NVWA (nvwa.nl)
Belgium: FAVV (favv-afsca.be)
Germany: BfR (bfr.bund.de)
United Kingdom: FSA (food.gov.uk)
United States: FDA (fda.gov) — FDA Food Code
EU general: EU Regulation (EC) 852/2004 on food hygiene
International: Codex Alimentarius CAC/RCP 1-1969 (revised 2020)

Allergens & dietary information

Allergen information is indicative. When in doubt about allergens in preparations, always contact the supplier or a certified allergological adviser. KitchenNmbrs accepts no liability for allergic reactions or diet-related harm.

Copyright & sources

All sources mentioned (Escoffier, McGee, CIA Professional Chef, etc.) are the property of their respective publishers and authors. KitchenNmbrs cites these works in accordance with fair use for informational purposes. The source attribution at the bottom of each technique page is not a complete bibliography but an indication of primary sources consulted.

Limitation of liability

To the extent permitted by law, KitchenNmbrs B.V. disclaims all liability for direct or indirect damage arising from the use of information on this page. This includes but is not limited to: financial damage from incorrect cost price calculations, damage from food safety incidents, and damage from technical errors or unavailability of the website. The information on this page does not replace professional culinary advice or legal advice.

Calculate the cost price including preparation time

KitchenNmbrs automatically calculates the food cost per portion including the preparation time of labour-intensive preparations such as brunoise.

7 days free. No credit card required. Start free trial →

Sources and legal information

Auguste Escoffier — Le Guide Culinaire (Flammarion, 1903/2011 edition) — standard cuts
CIA (Culinary Institute of America) — The Professional Chef, 9th edition (Wiley, 2011) — brunoise dimensions
Jacques Pepin — La Technique (Pocket Books, 1976/2012 edition) — visual step-by-step method
Harold McGee — On Food and Cooking (Scribner, 2004) — oxidation on cut surfaces
NVWA — Colour-coding system hygiene professional kitchen (2022)
EU Regulation (EC) 1169/2011 — 14 mandatory allergens (celery)