Grand Marnier soufflé is a classic French dessert. The soufflé is made with a combination of Grand Marnier, egg whites, butter, and sugar, while grated orange rind can be used for extra flavor. The bitter is used for rubbing the soufflé cup on the inside.
The mixture is baked on the bottom of the oven and it's then served immediately. It's believed that the key to a good Grand Marnier soufflé lies in the density of the egg whites – they should be whipped until the peaks develop a consistency that's firm, but not too full of air.