Food-truck menu design: prep capacity, service speed and food waste

Define the production boundary before dishes

The illustrative Seattle truck sells chicken bowls, vegetable bowls and sealed nonalcoholic drinks. Grain, vegetables, sauce and assembly sequence are shared; protein changes. No fryer-dependent dish, made-to-order drink, catering or platform-delivery stream is modeled.

This boundary does not prove a short bowl menu succeeds everywhere. King County asks for menu and food flow because preparation, cooling, refrigeration, sinks, water and wastewater must fit the operation. An equipped truck may still need a revised approval path after a menu change. State vehicle review is separate.

Map receiving, preparation, cooking/cooling if used, transport, holding, assembly and disposal. Each needs an approved method and responsible person. A two-hour kitchen session is a planned time constraint, not a food-safety shortcut or observed speed.

Make the ingredient and paid-work map explicit

Weighted recipe $3.225 is before prepared loss. Chicken allowance assumes five ounces cooked; component costs already use planning raw-to-cooked yields. Weigh purchases, cooked yield and portions before using a vendor’s pack price. Do not count cooking loss twice as unsold waste.

Prep clock time and individual labor are different. Five two-hour sessions use ten weekly kitchen clock hours within the referenced twenty-hour membership; overlapping staff are both paid. The published tariff does not establish that required cooling/equipment is available at those times.

A longer menu can reduce sellable orders

Three service hours less thirty interruption/restocking/cleaning minutes leave 150 usable station minutes. Assembly at 1.5 minutes limits output to 100 orders. Assistant payment/handoff at 45 seconds is parallel, with 200 capacity.

At unchanged base contribution, twenty unserved orders represent $211.97 potential contribution. This compares capacity, not actual lost sales: customers may wait, switch or never arrive. The extra recipe might also change price, food, waste and staffing, requiring a revised model.

Time realistic peak sequences with resupply/exceptions, not an ideal bowl before opening. Queue bursts can fail despite sufficient average capacity. A helper can restock/handoff, but this model does not grant that helper another assembly station. Hiring alone cannot remove a physical bottleneck.

Separate production yield from unsold food

For 80 sold bowls with 4.0% prepared loss, batch-equivalent production is 83.3 gross portions. This expected-volume formula is not a fractional physical prep instruction or a guaranteed batch plan. Set actual batches within the approved process.

Log cooking yield, overportioning, contaminated/dropped food, unsold prepared food and returns separately. A food-cost percentage cannot identify which process failed. Record prep quantities, opening/closing stock, sales and disposal reasons before changing batches.

Seven ingredient-days in the model is a month-end financial stock convention. It does not authorize cooked chicken/bowls to sit seven days. Ordinary applicable state holding is hot 135 F or above/cold 41 F or below with explicit exceptions/procedures. Under WAC 246-215-03515(2), the permitted time-temperature cooling method reaches 70 F from 135 F within two hours and 41 F within six total hours; a separate shallow-layer/equipment method also appears in the rule. Follow the approved process and complete Washington rule.

Price the order, then charge the whole calendar

Mix and expected drink yield $15.60 sales. Prepared loss, drinks, serviceware, tax-aware processing and state B&O leave $10.60 contribution before shifts, route, sites, overhead and debt. A favorable ingredient percentage alone does not pay those commitments.

Complete $0.74 serviceware needs a compatible hot-food container/lid quote. The inspected 32-ounce container has a separate lid; a cold-only PLA lid alongside it is not a hot-use specification. Seattle packaging/utensil rules require the actual accepted procurement set.

Processing uses Square Free in-person fees on tax-inclusive payment. Paid owner prep and employee service then need the route’s total contribution. They do not become free because the menu is short.

Keep a trial record that can change the forecast

Test ordinary demand and peak load. Compare times, waste and paid hours with assumptions; rerun the order calculation after station changes. Reduce batches when sell-through is weak. Add a dish when its incremental demand/contribution justifies the extra process.

Monthly liquidity retains winter, cancellations and debt despite full summer service. Menu trials should replace unsupported inputs, not merely produce a polished menu photograph.