Two kitchens can buy from the same suppliers, at the same prices, with the same waste, and still land eight points apart on food cost. When that happens the answer is almost never purchasing. It is the mix.
Food cost is an average, not a lever
A blended food cost tells you where you ended up. It does not tell you which dishes took you there. A menu carrying one dish at nineteen percent and another at forty eight percent can average out to something that looks acceptable on a report while quietly rewarding guests for ordering the wrong thing.
What to measure instead
Plot every dish on two axes: how often it sells, and how much cash margin it contributes. Four groups fall out. The dishes that sell well and earn well are your sellers and they should be the easiest thing on the menu to find. The dishes that sell well and earn badly are the expensive ones, and they usually need re-costing or re-plating rather than deleting. The dishes that earn well and sell rarely need a better position or a better description. The dishes that do neither are just length.
The change that actually moves margin
Reposition before you reprice. Moving a strong dish to the top of its section will do more in a week than a five percent price rise will do in a quarter, and it will not cost you a single guest.
