Quick answer
For one trading week, separate waste by where it happened: storage, preparation, unsold food and customer returns. Measure a manageable sample consistently and value it at ingredient cost. Use the result to choose one change; do not confuse a week's observations with a reliable annual saving.
Choose the boundary before putting out a scale
Decide whether you are measuring the whole kitchen or a specific problem such as pastry leftovers. A narrow audit completed every day is more useful than an ambitious one abandoned by Wednesday. List what is included, which shifts are covered and whether liquids are measured separately.
Ask the team where recording can happen without obstructing service or safe waste handling. Do not recover discarded food from bins to weigh it. If collecting waste temporarily, use an approved hygienic method and remove it promptly. The record should never create a new contamination, slip or pest problem.
Make reasons specific enough to change
Storage loss could mean an unopened case expired, an opened pack was forgotten or a refrigeration problem made stock unusable. These need different remedies. Keep the main categories short, but allow a reason that explains the largest losses.
For countable products, units may be more practical than weight. For mixed peelings, a batch weight may be enough. Record the method so a count of six pastries never gets added to a weight of 600 g. WRAP's Guardians of Grub resources provide a broader starting point for hospitality waste measurement.
Date/shift | Item or waste stream | Quantity | Unit | Reason | Ingredient cost basis | Recorded by | Proposed action
Further reading: WRAP: Guardians of Grub
Value waste at the right stage
An unsold sandwich costing £1.25 in ingredients is not automatically a £5 cash loss just because its menu price is £5. The selling price includes costs and margin that would only be earned if another customer actually bought it. Keep ingredient cost and possible lost sales as separate measures.
In an original example, 14 unsold sandwiches at £1.25 ingredient cost contribute £17.50 to the audit. A further 2 kg of spoiled tomatoes at £2.20 per kg contributes £4.40. The measured ingredient total is £21.90. Labour, energy, disposal and packaging may add costs, but include them only with a clear calculation and avoid double-counting.
Prepared food needs a batch cost or a reasonable recipe-based estimate. Mark estimates as estimates. You can improve the costing after finding the main loss; nobody needs to spend half an hour pricing a teaspoon of mixed garnish during service.
Turn the first week into a controlled change
Group the result by reason and product. A large unavoidable preparation trim is different from food prepared for demand that never arrived. Check whether a costlier ingredient contributes more money even when its waste weight is small. Weight alone can hide that distinction.
Choose one intervention for the next comparable week: reduce a late batch, change the opened-pack location or clarify a recipe quantity. Record who owns the change and the trade-off to watch, such as earlier sell-outs or more preparation time. Include sales or covers as context so a quieter week does not automatically look like an improvement.
Explain the purpose to staff before starting. The café thread linked below describes recording that failed during busy periods. If your sheets have gaps at the same time every day, simplify the process or change when the observation occurs. Missing entries are a design problem to solve, not permission to invent zeros.
After the trial, keep only the measurements that lead to decisions. Repeat a broader audit when the menu, supplier mix or service pattern changes. A useful record should earn the time it takes to maintain it.
Use a recurring task to assign the review and house knowledge to explain the recording method. Your own measurements and costing sheet remain the basis for decisions. Set up a waste-review routine in Unpickle.