In this tutorial I'll show you how to make a Mad Hatter's Hat Cake Topper. It can be used as a decoration or a top tier. If you want the hat to have cake inside, simply substitute the polystyrene with cake.
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Place a piece of greaseproof paper on a cake drum. Lift the paste from the board (be careful not to stretch it) and place it bottom side up on the greaseproof (the non-textured side facing up).