Give your 4th of July party some sizzle. The Pop Rocks will pop from the moisture in the cake, so don’t pour them in earlier than one hour before serving.
1 Red sheet cake
1 White sheet cake
1 Blue sheet cake
1½-inch Round cookie cutter (or reuse a clean empty fruit or vegetable can before you toss it into your recycle bin)
Cut circles from each of the three cake slabs. Remove centers of the cake circles with an apple corer or jumbo straw and set aside.
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Stack the three layers of cake circles and secure with frosting in between layers.
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One hour before serving, pour pop rocks into the center of the cakes and place a piece of licorice in to make the “fuse.” Add back some of a blue center previously set aside to secure the licorice.