Your food costs can spike by 3-5% overnight if your experienced chef walks out the door tomorrow. Years of undocumented knowledge about supplier yields, seasonal timing, and trim loss techniques vanishes with them. Here's how to capture that expertise before it's gone forever.
What knowledge often disappears?
Your veteran kitchen staff carry around a goldmine of cost-saving information. But it's all locked up in their heads:
- Trim loss per supplier: Which fishmonger delivers salmon with less waste
- Seasonal purchasing: When asparagus is cheapest
- Hidden costs: Which products generate more waste than expected
- Processing techniques: How to get the most out of expensive ingredients
- Supplier-specific tips: Which butcher gives you the best meat for your money
⚠️ Heads up:
If this knowledge isn't documented, one person leaving can increase your food cost by 3-5%. With €300,000 annual turnover, that means €9,000-€15,000 in extra costs.
Trim loss knowledge that often gets lost
Your seasoned staff know exactly how much yield you'll get from different products. And this intel is worth its weight in gold:
💡 Example:
Your experienced chef knows that:
- Supplier A: whole salmon 2kg → 1.2kg fillet (60% yield)
- Supplier B: whole salmon 2kg → 1.0kg fillet (50% yield)
- Supplier A costs €2/kg more, but delivers €4/kg lower actual fillet price
This knowledge can save you €2,000+ per year on salmon alone.
Other examples of loss knowledge:
- Beef: Which cuts have the least trim loss
- Vegetables: Which seasons give the best yield
- Shrimp: Unpeeled vs. peeled - when each is more cost-effective
- Cheeses: Which rinds you can use vs. discard
Purchasing timing and supplier knowledge
Experienced buyers have developed an internal radar for optimal timing and sources. Most kitchen managers discover too late that this timing knowledge can't be replaced by Google searches or supplier catalogs:
💡 Example seasonal knowledge:
An experienced buyer knows:
- Asparagus: March-April 40% cheaper than May-June
- Oysters: September-February optimal quality/price ratio
- Game: October-November ideal purchasing for winter
- Strawberries: Dutch season vs. imports - difference of €3/kg
Hidden cost losses from lack of knowledge
Without this experience, you'll hit hidden costs that destroy your food cost targets:
- Wrong cutting method: 10% extra loss on expensive ingredients
- Poor supplier choice: Higher purchase prices for lower quality
- Wrong timing: Purchasing out of season at double the price
- Waste from ignorance: Throwing away usable parts
⚠️ Heads up:
A new buyer without this knowledge can push your food cost from 30% to 38% within 3 months. With €25,000 monthly turnover, that costs you €2,000 extra per month.
How do you document this knowledge?
You can systematically capture this valuable information before it walks out your door:
- Trim loss per product: Have your experienced chef calculate the actual yield of all main ingredients
- Supplier database: Note per supplier the pros and cons, price differences, quality
- Seasonal calendar: Create an overview of optimal purchasing times per ingredient
- Processing techniques: Document how to get maximum value from each product
💡 Practical example:
Create a "knowledge transfer session" with your experienced chef:
- Go through your top 20 ingredients together
- Have them calculate the actual trim loss
- Note tips per product and supplier
- Document in a system everyone can access
This takes you 4 hours, but can save you thousands of euros.
Document digitally for the future
Paper notes disappear. Digital systems make this knowledge available to your entire team. Tools like KitchenNmbrs allow you to:
- Document trim loss per ingredient with actual yields
- Link supplier information to ingredients
- Track seasonal price variations
- Share this knowledge with your entire team
This transforms one person's experience into your entire company's competitive advantage. And you're never again dependent on individual knowledge walking out the door.
How do you document purchasing and trim loss knowledge? (step by step)
Inventory critical knowledge
Make a list of your 20 most important ingredients and go through with your experienced chef what he/she knows about trim loss, suppliers and seasons. Note per ingredient the actual yield and any tips.
Calculate actual cost prices
Have your experienced staff member calculate the actual trim loss per main ingredient. Use the formula: actual price per kilo = purchase price / (yield% / 100). This shows you what products really cost.
Document in accessible system
Record all knowledge in a digital system your entire team can access. Use an app like KitchenNmbrs to track trim loss, supplier info and seasonal tips per ingredient.
✨ Pro tip
Schedule weekly 30-minute "knowledge sessions" with your most experienced prep cook during their final 2 months before retirement. Focus on one ingredient category per session - proteins week 1, vegetables week 2, etc. This structured approach captures 15+ years of purchasing wisdom before it disappears forever.
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
What if my experienced chef doesn't want to share what he knows?
Frame it as appreciation for his expertise and as a way to honor his knowledge. Explain that you want to capture his experience so the kitchen can always operate at his level.
How much time does it take to document all this knowledge?
For your 20 most important ingredients you need about 4-6 hours. That seems like a lot, but can save you thousands of euros per year in food cost and prevents costly mistakes when staff changes.
Do I need to do this for all ingredients or just the important ones?
Start with your top 20 ingredients - they make up 80% of your food cost. Focus first on the most expensive products and those with lots of trim loss like fish, meat and seasonal vegetables.
How do I prevent this knowledge from getting lost again?
Use a digital system that's accessible to your entire team. Update the information regularly and make sure new staff have access to this knowledge database.
📚 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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