Reducing kitchen food waste: measure the loss before you fix it
Use a 14-day waste log to separate spoilage, over-prep, trim and plate returns. Rank losses in euros, test a correction and measure again.
Food waste reduction starts with a measured baseline. For 14 days, weigh food before it reaches the bin and record item, cause, service and ingredient cost. Separate avoidable loss from unavoidable trim. Fix the largest avoidable cost first, then repeat the measurement at a comparable level of sales.
The working method
- Spoilage: record item and expiry date. Rotate the earliest-expiring product first, check storage and reduce orders that exceed usable shelf life.
- Over-prep: compare prepared quantity with covers and sales by service. Prepare smaller batches and keep a safe, documented plan for leftovers.
- Trim: weigh raw product and usable yield. Separate unavoidable bones or peel from cuts that better technique could preserve.
- Plate returns: log the dish and returned component. Check portion size, garnish, quality and guest feedback before reducing the portion.
- Do not mix packaging or liquid from washing into food weights. Use ingredient acquisition cost, not menu selling price, when valuing loss.
A worked example
The log records 31.5 kg of avoidable waste at an average ingredient cost of €4.80/kg.
| Baseline weight | 31.5 kg | Separate causes before acting |
|---|---|---|
| Baseline cost | 31.5 × €4.80 = €151.20 | Cost of discarded ingredients |
| Reduction target | 31.5 × 25% = 7.875 kg | Target saving: €37.80 |
| Follow-up target | 23.625 kg, €113.40 | Compare at the same cover count |
A 25% reduction saves €37.80 per comparable fortnight. If covers change, compare waste per cover before claiming the saving.
Keep the routine
- 1Set up the log. Put scales and a short record at the waste point. Record weight, item, cause, date, service and cost.
- 2Rank causes. At day 14, total kilograms and euros by cause. Choose the largest avoidable euro loss.
- 3Test one change. Reduce one prep batch, change rotation or revise a component. Assign an owner and protect food safety.
- 4Measure again. Repeat for two weeks and compare euros and grams per cover. Keep the change only if the evidence supports it.
Frequently asked questions
FAQ
- Should I count unavoidable trim?
- Yes, but keep it separate. It affects yield and recipe cost; it should not inflate the avoidable-waste target.
- How do I value a cooked dish?
- Use the batch ingredient cost per usable kg or serving. Menu price measures sales, not the cost of discarded food.
- Is donation or reuse always possible?
- No. Use only options that meet your documented food-safety procedure. Prevent overproduction before relying on a destination for surplus.
- How often should I review?
- Review the log weekly, establish the initial 14-day baseline and repeat the measurement after each correction.
Keep reading
- Inventory management for restaurants: the system that keeps your margins honest
What restaurant inventory management actually covers, where losses hide, and how to build a system that catches them.
- Restaurant par levels: set stock targets that protect cash and service
Set replenishment targets from usage, delivery intervals, a measured buffer and shelf life. Order only the gap after stock and confirmed deliveries.
- Recipe costing: know the real cost of every plate
Convert pack prices into usable ingredient cost, batch cost and cost per serving. Include sauces, oil, garnish and the measured portion.
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