7 yolks 3 whole eggs and beat with 1 cup sugar, add the juice of 1/2 lemon zest, the walnuts, flour and baking powder. The mixture is baked in a buttered sprinkled with flour form cake in a moderate oven. Egg whites are broken down in 1 and 1/2 cup sugar in a water bath until a thick foam, and added the rest of the lemon juice. Cool base is cut in half and smeared with egg white foam inside and out. Decorate with optional chocolate sprinkles and ground walnuts.