Lobster Thermidor, as served at The Cowshed, Wakefield, United Kingdom, includes both lobster and crayfish meat, but is presented in the classic style
Lobster Thermidor is a French dish consisting of a creamy mixture of cooked lobster meat, egg yolks, and brandy (often cognac), stuffed into a lobster shell. It can also be served with an oven-browned cheese crust, typically Gruyère. The sauce must contain mustard (typically powdered mustard). Due to expensive ingredients and extensive preparation involved, Lobster Thermidor is usually considered a recipe primarily for special occasions.