The recipe as written uses chocolate sponge cake, simple syrup, chocolate frosting, and chocolate glaze. The chocolate sponge cake recipe that I used was found here on Recipezaar from Derf and I added some additional guidelines and tips. The chocolate glaze recipe is from AllRecipes.com. Feel free to use the basic outline of the recipe to create your own petit fours. Just use the basic components (sponge cake aka genoise, simple syrup, some sort of filling like frosting/jelly/buttercream/fruit curd, and glaze such as marzipan/fondant/ganache) and follow the assembly instructions given. You can add flavored liquor, coffee, etc to the simple syrup recipe (equal parts sugar and water) to give a little extra flavor.