What is "lobster thermidor"

Lobster thermidor \Lob"ster ther"mi*dor\, Lobsters thermidor \Lob"sters ther"mi*dor\, n. a dish of lobster meat cooked with a rich creamy wine sauce, stuffed back into the lobster shell, sprinkled with grated cheese, and browned.

n. A creamy, cheesy mixture of cooked lobster meat, egg yolks, and brandy or sherry, stuffed into a lobster shell, and optionally served with an oven-browned cheese crust.

n. diced lobster mixed with Mornay sauce placed back in the shell and sprinkled with grated cheese and browned

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 and extensive preparation involved, Lobster Thermidor is usually considered a recipe primarily for special occasions.