Everything in this course needs one number to be worth anything, and it is a number almost no restaurant has: how many kilos left the building, and in which direction. The cost control course got its version with a bucket and a clipboard for a week. This is the same discipline pointed at material instead of money, and it takes a cheap scale, three buckets and one week per quarter.
⚖️ Three buckets, one week
Do not try to weigh everything forever. Weigh three streams for one week, four times a year, on a comparable week — the same instruction the kitchen course gave about timing tickets and the room course gave about measuring noise.
| Bucket | What goes in it | What it tells you |
| Prep | Trim, peelings, bones, the ends of things | Yield and menu design — topic 2 |
| Plate | What comes back from the dining room uneaten | Portions, and whether a dish is wrong |
| Spoilage | What died in the walk-in or was overproduced | Ordering, rotation and the forecast |
Weigh each bucket at the end of service, write the kilos on a sheet on the wall, and add the covers for that day. That is the whole system. At the end of the week you have three numbers and a per-cover figure — the example restaurant runs at about 62 grams a cover across all three — and the split between them is what tells you which course to go back to.
The plate bucket is the uncomfortable one and the most valuable. Food coming back uneaten is the guest telling you something they will never say out loud: the portion is too big, the dish is not good, or the side is being ignored. The sales analytics course can tell you what sells; only this bucket tells you what gets left.
🔧 What each number sends you to change
As with every measurement in this library, the point is the decision behind it.
- Prep bucket heavy? Either the yield is poor — a specification or a supplier question from the cost control and sourcing courses — or the menu has nowhere to put the trim, which is topic 2 of this course.
- Plate bucket heavy on one dish? The portion is too large or the dish is not working. Both are cheaper to fix than they are to keep paying for, and the plate waste is the only honest evidence you will get.
- Plate bucket heavy on a side? Everybody is leaving the garnish. Stop serving it, or serve less of it — this is the single most common finding and the easiest saving in the whole exercise.
- Spoilage heavy? Ordering too much, par levels wrong, rotation not happening, or a forecast that is not being used. Cost control course for the first three, sales analytics for the last.
- All three flat but the general bin still full? The waste is not food — it is packaging, and that is the first course of this group.
Keep the sheets. Four weeks a year, compared against each other, show whether anything you changed actually moved — and, as everywhere else in this library, the per-cover version is the one that survives a busy quarter.
📉 What good looks like
Two honest cautions about targets, because this is where measurement turns into theatre.
Zero is not the target. A kitchen producing zero waste is either buying everything pre-prepared — which moves the waste up the chain and usually costs more — or running out of things. Some trim is inherent to cooking with whole ingredients, which the sourcing course actively encouraged. The target is the avoidable part, and the buckets tell you which part that is.
Compare against yourself. Published benchmarks for restaurant food waste vary wildly because they measure different things in different ways. Your first quarter's numbers are your benchmark, exactly as the financial reporting course said about industry averages: the useful comparison is against your own last quarter.
A reasonable ambition for a small restaurant that does the work in topics 2 to 4 is to move a meaningful share of the avoidable waste over a year — some prevented, some eaten by people, some composted — and to be able to say which is which. That is a better outcome than a percentage target nobody can verify, and it is the only version that survives topic 6's warning about what you may claim.
🧾 Where the numbers live
Put the weekly sheet in the same place as the waste log from the cost control course, because they are the same exercise seen from two sides: that one records what it cost, this one records what it weighed and where it went. Together they answer both questions a restaurant can be asked about waste, and neither is much use alone.
Then add the donation log from topic 3 and the collection dates from topic 4, and the picture is complete: kilos produced, kilos eaten by somebody, kilos composted, litres of oil collected. Four lines a month, all of them recorded by somebody as part of a job they are already doing.
That is also, not incidentally, exactly the evidence the previous course said you need before saying anything in public. A restaurant that can put a number on what it diverted has something specific and provable to say; one that cannot has a poster. The final topic is about turning those numbers into a plan that survives, and about how to talk about it without falling into the trap the first course of this group described.