Croque monsieur

Slice white bread three-quarters of an inch, or one and a half centimetres, thick.

Use white bread that is part stale rather than fresh, so it takes the butter without tearing.

Spread butter on the slices.

Build the sandwich as bread, butter, cheese, ham, cheese, and a second buttered slice, and nothing else.

Cook it in a frying pan with butter, not in an oven or a toaster oven.

Cook four minutes on each side.