As-Purchased (AP) vs. Edible Portion (EP): The Complete Yield % Guide
Why invoice purchase price is never dish recipe cost, butchery yield testing, prep trimming loss, and master benchmark yield tables.
What does a kilogram of beef tenderloin or a sack of Spanish onions really cost your kitchen? If your answer is “whatever the supplier invoice says”, your recipe costing, food cost percentages, and menu prices are fundamentally flawed and bleeding profit.
Raw food delivered to your loading dock is never 100% plate-ready. Roots are trimmed, peels discarded, silver-skin removed, fat caps rendered, and bones removed. The mathematical spread between As-Purchased (AP) and Edible Portion (EP) is the hidden boundary between restaurants bleeding cash and kitchens generating consistent profit.
1. The Invoice Price Fallacy in Recipe Costing
Consider a standard commercial kitchen scenario: You purchase 10 kg of head-on fresh prawns at $12.00/kg for a total invoice of $120.00. After peeling heads, shells, and tails, your prep cook yields only 5.5 kg of usable raw prawn meat (4.5 kg of waste in the trash).
If your recipe sheet uses the invoice cost of $12.00/kg, you assume a 100g prawn portion costs $1.20. In reality, the $120.00 invoice only produced 5.5 kg of meat, making the true usable cost $120.00 / 5.5 kg = $21.82/kg ($2.18 per 100g). You bleed $0.98 per plate on every single order.
2. Defining AP, EP, and Usable Yield %
The raw, unprocessed ingredient exactly as delivered by the food purveyor on the purchase invoice.
The net usable portion of the ingredient after trimming, butchery, peeling, and culinary preparation.
The percentage of usable product remaining relative to raw weight. Higher yield % equals lower food waste.
3. The 3 Core Yield Equations
The three mathematical equations every head chef and culinary operations director must implement:
Example: (800g EP / 1000g AP) × 100 = 80% Yield
Example: $10.00 / 0.80 = $12.50/kg
Example: Need 10kg clean / 0.80 = Order 12.5kg AP
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Put these benchmarks into practice. Test raw ingredient yields, packaging overhead, and target gross margin % in seconds.
4. Butchery Case Study: Beef Tenderloin Trimming
Let's analyze a standardized butcher test for a 5.000g (5 kg) whole PSMO Beef Tenderloin purchased at $32.00/kg (Total invoice: $160.00):
| Butchery Cut Breakdown | Weight (Grams) | % of Total | Culinary Destination |
|---|---|---|---|
| Center-Cut Filet Steaks (Primary EP) | 3.250 g | 65.0% | Center-plate entrees (200g portions) |
| Clean Trimming Pieces (Chain Meat) | 600 g | 12.0% | Pasta ragu, beef stroganoff, stir-fry |
| Fat Cap & Tough Silver-Skin | 1.150 g | 23.0% | Discarded prep waste |
| TOTAL AS-PURCHASED (AP) | 5.000 g | 100.0% | Effective Steak Cost: $32.00 / 0.65 = $49.23/kg (+53.8%) |
5. Master Yield % Benchmark Table (Proteins & Produce)
Use this master reference guide of industry-standard culinary yields before conducting your in-house tests:
| Ingredient | Prep / Butchery Action | Avg Usable Yield % | Cost Inflation Multiplier |
|---|---|---|---|
| Spanish Yellow Onions | Top, root, and skin peeled | 85% – 90% | +11% – +17% |
| Fresh Table Carrots | Peel and top removed | 80% – 84% | +19% – +25% |
| Romaine / Iceberg Lettuce | Core and bruised outer leaves removed | 70% – 76% | +31% – +42% |
| Whole Bone-In Chicken Breast | Deboned, deskinned, fat trimmed | 62% – 68% | +47% – +61% |
| Whole Round Atlantic Salmon | Headed, gutted, scaled, skinned fillet | 48% – 54% | +85% – +108% |
6. How to Conduct a Standardized Culinary Yield Test
Weigh the raw batch immediately upon delivery on a calibrated digital scale before any trimming begins.
Have your prep team process the batch according to kitchen SOPs, separating clean portions, usable trim, and pure waste.
Weigh the finished plate-ready items. Divide EP weight by initial AP weight to obtain your verified yield percentage.
Save the yield percentage into TareKit's ingredient catalog to automatically update all cascading recipe costs.
7. Preventing Yield Leaks on the Kitchen Line
Dull Knives Destroy Yield: Prep cooks using dull knives shave off 5%–10% excess usable meat attached to discarded fat caps. Invest in professional sharpening and train line cooks in proper butchery angles.
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Frequently Asked Questions
AP (As-Purchased) is the raw weight and cost of an ingredient as delivered from the supplier on the purchase invoice. EP (Edible Portion) is the usable weight and effective cost of the ingredient after peeling, trimming, deboning, and culinary prep.
EP Cost Per Unit = AP Purchase Price / (Usable Yield % / 100). For example, if whole onions cost $2.00/kg with an 85% yield after peeling roots and skin, the usable EP cost is $2.00 / 0.85 = $2.35/kg.
When you calculate a recipe using invoice price ($10/kg) instead of effective yield price ($13.33/kg for a 75% yield protein), you underestimate recipe COGS by 33%. Consequently, your menu price is set too low, eroding your entire projected profit margin.