The base is prepared by making a dough macerate butter, flour and water. Not oiled put it in a baking dish, slightly rising edges. Bake in a hot oven. For the cream: Mix sugar, flour and egg yolks. Add the juice and grated peel of lemon and then 3 cups boiling water. Concentrate on low heat, stirring continuously. cold cream is spread on the cold base. Decorate with beat thick snow with a little sugar egg whites.