Think making your own stocks and sauces saves money without affecting your food costs? That's not always true. Sub-recipes add complexity layers that many chefs overlook in their calculations. You must first price each sub-component, then factor it into your main dish for accurate costing.
Why sub-recipes complicate cost calculations
Serving steak with store-bought demi-glace? Simple math: steak + sauce + sides. But homemade stock from beef bones, aromatics and herbs requires calculating that stock's per-liter cost first.
⚠️ Note:
Chefs often ignore time and energy costs in sub-recipes. Homemade mayo might cost €0.50 in ingredients, but requires 15 minutes of prep time.
Price your sub-recipe first
Each sub-recipe needs its own cost calculation. List every ingredient and determine costs per unit - whether that's per liter, kilogram, or portion.
💡 Example: House beef stock
For 2 liters of finished stock:
- Beef bones 2 kg: €6.00
- Mirepoix vegetables: €2.50
- Tomato paste: €0.40
- Herbs and aromatics: €0.60
Total: €9.50 for 2 liters = €4.75 per liter
Factor in yield loss and reduction
Sub-recipes lose volume through reduction, straining, and skimming. Factor this loss into your pricing or you'll underestimate costs.
💡 Example: Stock reduction math
Starting with 3 liters water plus €9.50 in ingredients. After 6 hours cooking, you have 2 liters of finished stock.
- Final yield: 2 liters from 3 liters = 67%
- Actual cost: €9.50 ÷ 2 liters = €4.75 per liter
Always calculate using final yield, not starting volume.
Integrate sub-recipe costs into main dishes
Once you know your sub-recipe's unit cost, treat it like any purchased ingredient in your main dish calculations.
💡 Example: Steak with house jus
Per portion breakdown:
- Ribeye steak 200g: €7.20
- House jus 50ml: €0.24 (from €4.75/liter)
- Potato and vegetables: €1.80
- Finishing butter, herbs: €0.40
Total dish cost: €9.64 per portion
Labor costs for intensive sub-recipes
A stock simmers for 6 hours but needs only 30 minutes of active work. From years of working in professional kitchens, I've learned to separate active prep time from passive cooking time.
- Active tasks: chopping, browning, skimming, straining
- Passive time: simmering, steeping, cooling
- Labor rate: roughly €0.50 per minute of hands-on work
⚠️ Note:
Only factor labor costs for truly intensive sub-recipes like fresh pasta or elaborate sauces. Simple vinaigrettes don't warrant this level of calculation.
Tracking and record-keeping
Document each sub-recipe: ingredient lists, quantities, final yields, and per-unit costs. This creates a database for quick calculations across multiple dishes.
Tools like food cost calculators let you save sub-recipes as 'ingredients' with predetermined costs, streamlining calculations when you use them in new dishes.
How do you calculate the cost price of dishes with sub-recipes?
First calculate the cost price of your sub-recipe
Make a list of all ingredients for your sub-recipe (stock, sauce, crème). Add up the costs and divide by the number of units you have left after preparation. This becomes your cost price per liter, kilo or portion.
Determine how much sub-recipe you use per portion
Measure exactly how much of your sub-recipe you use per portion of the main dish. A soup spoon of jus is about 50ml, a dollop of crème fraîche about 20 grams. Be specific, no estimates.
Calculate the sub-recipe into your main dish
Use the cost price of your sub-recipe as an ingredient in your main dish. Multiply the cost price per unit by the amount you use. Add this to all other ingredients of the main dish.
✨ Pro tip
Track actual yields over 30 days rather than estimating - most chefs underestimate reduction rates by 15-20%. Document your real yields with photos and notes to build accurate cost models.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
Should I include labor costs in my sub-recipes?
Only for labor-intensive preparations like handmade pasta or complex mother sauces. Simple items like vinaigrettes don't justify labor calculations. Use approximately €0.50 per minute of active chef time when you do include it.
How do I handle reduction and volume loss?
Always calculate using final yield, not starting volume. If 3 liters of water becomes 2 liters of finished stock, divide total ingredient costs by 2 liters. This ensures accurate per-unit pricing.
Can I reuse sub-recipe costs across multiple dishes?
Absolutely - that's the efficiency gain. Calculate your stock or sauce cost once, then apply that per-unit price to every dish using that sub-recipe. This streamlines your costing process significantly.
What if my sub-recipe spoils before I use it all?
Calculate based on actual usage patterns, not maximum shelf life. If your stock lasts 5 days but you typically use it within 3, factor waste into your cost calculations.
How often should I update sub-recipe costs?
Monthly at minimum, or whenever ingredient prices change significantly. Sub-recipes contain multiple components, so small price fluctuations can compound into major cost variations.
Should I cost out garnish elements made in-house?
Yes, especially for signature garnishes or pickled vegetables that require time and ingredients. Even simple herb oils or seasoning blends add up when you're serving high volumes.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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