Place a cake cardboard in the bottom of a 7-inch springform pan. Place a 4-inch acetate cake collar
around the inside of the pan. If you don't have an acetate collar, you can form a tall ring with aluminum foil—you just need something to extend the top of the springform pan about 4 inches. You can also use a different size of springform pan, just be aware that you may not get the same number of layers if you make a larger cake.