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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 cognac or brandy, 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).
Lobster Thermidor was created in 1894 by Marie's, a Parisian restaurant near the theatre Comédie Française, to honour the opening of the play Thermidor by Victorien Sardou. The play took its name from a summer month in the French Republican Calendar, during which the Thermidorian Reaction occurred, overthrowing Robespierre and ending the Reign of Terror. Due to expensive and extensive preparation involved, Lobster Thermidor is usually considered a recipe primarily for special occasions.
Lobster Thermidor is referenced in the famous Monty Python "Spam" sketch.