Leek
poireau · leek · porro
Leek: what every chef needs to know
Leek sits firmly among the kitchen standards as a bulb vegetable from the Alliaceae family (together with onion and garlic) with a milder sweeter flavour profile than its family members. The white stem base is the most used part: this is the etiolated section growing underground. The dark green fronds are more intensely flavoured and more fibrous, suitable for stock. Leek contains significantly more moisture than onion but has the same allicin-like aromatic compounds. When cooked slowly over low heat, leek caramelises subtly and develops a sweet, wonderful depth. A crucial consideration with leeks is soil contamination: between the leaf layers there is almost always sand and dirt. Thorough washing is essential. Cut off the root end and darkest green, halve the leek lengthways and wash thoroughly under cold running water while spreading the layers. In classic cuisine, leek is the base of vichyssoise and cock-a-leekie soup. As a garnish, confit or roasted with Parmesan, it is a premium side dish.
Leek: nutritional values per 100g (raw)
Based on unprocessed product. Source: NEVO 2021 (RIVM/WUR) — the Dutch food composition database, managed by RIVM and Wageningen University.
Nutritional values are indicative for unprocessed raw materials. Preparation method, variety and origin may affect values. Source: NEVO 2021 (RIVM/WUR).
Leek: classic dishes
Proven preparations from the professional kitchen — from haute cuisine to global restaurant classics. Use as inspiration for menu development and recipe costing.
French-American cold leek and potato soup with cream and chives. Created by chef Louis Diat at the Ritz-Carlton New York (1917). Leek is the flavour-defining ingredient alongside potato in this refined soup.
Flemish leek tart on bread dough or puff pastry with a filling of braised leek, eggs and cream. A savoury tart classic from the northern French and Belgian kitchen, in which leek is the sole vegetable.
Scottish soup of chicken and leek, sometimes supplemented with prunes (dried plums, historically). One of the oldest documented Scottish recipes, traceable to the 16th century.
Savoury tart with braised leek rings, fresh goat's cheese, eggs and cream in a shortcrust pastry. A modern bistro classic in the Dutch and French restaurant kitchen.
Boiled or steamed leek served with a warm sauce of cream, wholegrain mustard and lemon juice. A classic Belgian-French side dish for fish and poultry.
Braised leek stalks gratinéed with béchamel sauce and cheese (Gruyere or Emmental). A fundamental side dish in the French and Belgian kitchen, popular in the winter months.
Leek: preparation techniques
Exact temperatures and times for HACCP compliance. Core temperature is leading for poultry and pork.
in olive oil, thyme, garlic, salt. Cover with foil. Premium garnish with fish or poultry.
White and light-green part, rings. Cook until translucent without colour. Base for vichyssoise.
half lengthways. Rub with olive oil. Grilled with romesco or Parmesan.
White part only, fine julienne. Cool in ice water for crunchiness. Garnish for cold dishes.
Leek: HACCP storage and food safety
Based on Codex Alimentarius (WHO/FAO) and EU Regulation 852/2004. Consult your national authority (NVWA/FDA/FSANZ) for applicable local standards.
Leek: global seasonal overview
Availability per climate zone — Northern Europe, Mediterranean and warm climate. Relevant for purchasing planning and international menus.
Season: August to March. Best quality Dutch leek: October–December. Summer leek (thinner, milder) available June–August. Winter varieties are thicker and have a more intense flavour.
Leek: EU-14 allergen information
Full overview compliant with EU Regulation 1169/2011 (Annex II). Raw material information — always verify with your supplier for processed products and possible traces.
Raw material information (unprocessed product). Processed products may contain traces. EU Regulation 1169/2011 Annex II.
Leek: wine pairings
Every wine recommendation is verified via at least 4 independent sources: wine specialists, sommeliers and culinary authorities. Serving temperatures conform to Wine Enthusiast and Vintec guidelines.
Leek has a mild, sweet-onion flavour. Aromatic, subtle wines pair best. Sancerre is THE classic pairing for leek-cheese tartlet: the chalky minerality and citrus-grass structure connect with the delicate leek flavour and complement cheese fillings such as Gruyere or goat's cheese.
- Sancerre Blanc (Henri Bourgeois, Vacheron)
- Pouilly-Fumé
- Menetou-Salon
- Touraine Sauvignon (betaalbaar)
The floral body and apricot-peach notes of Viognier suit leek-Gruyere preparations and leek gratin. The full texture stands on equal footing with the creamy consistency of braised leek.
- Condrieu AOC
- Viognier Pays d'Oc
- Saint-Joseph Blanc
- Viognier (Australië, Yalumba)
The rich, lightly sweet, and spiced style of Alsace Pinot Gris connects with flamiche (Flemish leek tart) and leek quiche. The apricot-smoky notes complement cheese and leek combinations.
- asace Pinot Gris (Hugel, Trimbach)
- asace Pinot Gris Grand Cru
- Grauburgunder Spätlese (Baden)
The white pepper and herbal structure of Grüner Veltliner cuts through the creamy richness of leek stews and leek soups without overpowering the mild leek flavour.
- Grüner Veltliner Federspiel (Wachau)
- Grüner Veltliner Kamptal DAC
- Grüner Veltliner Erste Lage (Bründlmayer)
The dry, neutral freshness of Muscadet sur lie is a versatile alternative for vichyssoise (cold leek soup) and lighter leek preparations. The yeasty complexity of sur lie ageing adds subtle depth.
- Muscadet Sèvre et Maine sur Lie
- Muscadet Côtes de Grandlieu
- Gros Plant du Pays Nantais
Wine advice is for culinary information purposes only. Wines and appellations are exemplary; availability varies by region and supplier.
Frequently asked questions about Leek
How do I wash leek thoroughly without damaging the structure?
Cut off the root end and dark fronds. Halve the leek lengthways leaving 2cm at the root end intact (so it stays together). Fan the layers open under cold running water, check visually and feel with your fingers for any grit. Spin or shake dry before use.
Do I also use the dark green part of leeks?
The dark green fronds are too tough and intense for garnish but excellent for stock, fond and bouquet garni. The transition from white to pale green is the ideal middle section for stir-fry and soup. The crisp white-pale green ring is most prized in fine cuisine.
What is the flavour difference between onion and leek in a dish?
Leek has a softer, sweeter and more nutty flavour profile than onion. Leek caramelises more slowly and gives a finer texture. In dishes where onion is too dominant (delicate fish stocks, fine sauces) leek is the better choice. Onion gives more sharpness and intensity in stews and dark stocks.
At what temperature should you store Leek?
Store Leek at 0°C to +4°C, compliant with EU Regulation 852/2004 and Codex Alimentarius guidelines.
How do you prepare Leek professionally?
The primary professional technique for Leek is Confiting (heel, oven) at 160°C oven for 30-40 min. Always verify core temperature with a calibrated probe thermometer.
Does Leek contain allergens?
Leek is free from all 14 EU declarable allergens under EU Regulation 1169/2011 Annex II. Always verify with your supplier for processed variants.
Alternatives for Leek
Professional substitutes for leek in hospitality: culinary alternatives, allergen-free options and seasonal replacements. Including HACCP storage conditions per alternative.
Legal disclaimer: For informational purposes only
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Informational character
The information on this page has been compiled exclusively as reference material for professional kitchen staff. KitchenNmbrs does not provide legal, medical or commercial advice. Data on preparation techniques, storage temperatures, HACCP guidelines and allergens is based on publicly available professional sources and applies to the raw ingredient in its unmodified state.
Your responsibility as operator (FBO)
Under EU Regulation 1169/2011 (Food Information Regulation) and EU Regulation 852/2004 (HACCP Hygiene Regulation), the Food Business Operator (FBO) is solely and exclusively responsible for:
- Providing accurate, up-to-date and complete allergen information to the end consumer;
- Determining allergens in the finished product based on current supplier documentation;
- Maintaining and documenting a demonstrable HACCP management system;
- Controlling cross-contamination risks within their own production environment;
- Compliance with local food safety authority requirements.
Allergen information: Limitations
The allergen information on this page relates to the ingredient as such. The actual allergen composition of your purchase may differ due to:
- Varying suppliers, production facilities or growing regions;
- Cross-contact during production, transport or storage ("may contain");
- Changed product formulations not yet reflected in public sources;
- Processing or preparation in your own kitchen that introduces new allergens.
Always verify allergens against the current specification sheets (spec sheets) from your supplier. Orally or informally provided allergen information is not legally valid under EU Reg. 1169/2011.
Milk allergen and lactose intolerance
The EU-14 allergen "Milk (including lactose)" covers two distinct conditions, both of which require declaration: (1) cow's milk allergy, an immunological reaction to milk proteins (casein, whey), and (2) lactose intolerance, an enzymatic deficiency (lactase) preventing digestion of milk sugar. Both groups must be informed separately on the menu. Lactose-free is not the same as milk-protein-free: a guest with cow's milk allergy may still react to lactose-free products.
Limitation of liability
KitchenNmbrs B.V. excludes all liability for direct or indirect damages arising from:
- Use of the information on this page as the basis for commercial or operational decisions;
- Allergic reactions, food poisoning or other health incidents involving guests or staff;
- Inaccuracies resulting from changed product compositions by third parties (suppliers);
- Non-compliance with food safety laws and regulations.
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Official sources and authorities
Legal basis: EU Reg. 1169/2011 Annex II (EU-14 allergens) · EU Reg. 852/2004 (HACCP) · Local food information legislation as applicable
