Let them eat cake!

Recipe for edible foaming lava care of Judy P here.

You will need a small, short juice glass or a shot glass that will fit snugly in the center of the Volcano Cake (a glass 3" tall and 1 1/2" in diameter would be perfect). You will also need one small box of Jell-o, one small bottle lemon juice and 1 tablespoon of bicarbonate of soda (baking soda). Make Jell-o according to package directions. Let cool 15 minutes. When Jell-O is still warm(not hot), fill juice glass 1/2 full with the warm Jell-O. Pour in enough lemon juice so that the glass is almost full, or about 1/2" from the top. Place glass down into hole in the cake so lip of glass is flush with top of cake. You are now ready to produce the effect. When ready, put 1 tablespoon of bicarbonate of soda into the glass and briefly stir (1-2 seconds). Jell-O foam will immediately pour out the top of the glass and flow down the sides of the cake.