Napoleon cake (mille-feuille) is made of puff pastry layers, filled with Diplomat Cream or German Buttercream (pastry cream lightened with whipped cream or butter). Napoleon is one of the most popular and loved cakes worldwide, although its exact origin is unknown. There are many recipes and versions for Napoleon. Grandma Emma and Leon are happy to share theirs. Quick Puff Pastry: Flour - 750 grams (27 oz), Butter or margarine - 600 grams (21 oz), 2 Eggs, Salt - 1 teaspoon, Vinegar - 1.5 tablespoons, Water - approximately 220 ml (7.5 fl oz). Custard Buttercream: Milk - 1 liter (1 quart), Sugar - 300 grams (11 oz), 4 eggs, Flour or starch - 120 grams (4 oz), Butter - 320 grams (11 oz), Vanilla sugar - 10-15 grams. Get the recipe here:https://videoculinary.com/recipe/napoleon-cake/