Scotch Egg Sauce

Sauce aux Œufs à l’Écossaise (Scotch egg sauce) teaches the white roux in its plainest, most useful form. The one true thing to know before you touch the pan is this: cook the flour in the butter before the milk arrives. Pale does not mean raw. Give the roux its few quiet minutes and the finished sauce will taste of milk, butter, nutmeg, and egg, never flour paste.

The source formula assumed a saucier beside a second pan of boiling milk, with enough boiled haddock or cod moving through service to justify the quantity. Your honest equivalent is one heavy saucepan, a smaller pan for the milk, and a whisk. No stockpot or salamander belongs here. This version is expanded only to meet the requested two-quart yield, with the butter-flour-milk ratio and three-eggs-per-pint proportion intact. The separate sauce station is scaffolding, but the white roux and its full ten-minute simmer are the dish. One cook, one stove, one evening.

When it is right, the Sauce aux Œufs à l’Écossaise is ivory and softly spoon-coating, with warm cubes of white and yolk held throughout rather than mashed into it. The moment that matters is the milk meeting the roux: add it in measured pours and whisk into the corners. If it lumps, don't panic. Ça se rattrape, and the method tells you exactly how.