Melting the butter and add the powdered sugar, 2 cups flour, cocoa and the walnuts. Shape small balls and drawing shapes in the beds of nuts. Pressed with a finger and excess is removed. Bake in a moderate oven. Separate carefully the forms while warm. The cream is prepared in a small saucepan put the eggs, milk, add sugar and 3 tbsp flour. Stir constantly to thicken. Light as cool a cream we fill the shells and glued two by two. Put in refrigerator. It is better to stay at least 2 hours to absorb the cream. 50 goals to go nuts, but ended very quickly.