Instructions: Make Jell-O according to package directions. Let cool 15 minutes. Fill juice glass 1/2 full with the warm Jell-O. (Not hot). Pour in enough lemon juice so that it is 1/2" from the top. Place the glass down in the well on top of the cake. Place the cake on a table and when everyone is ready, put 1 Tbsp bicarbonate of soda onto the glass and briefly stir. Jell-O lava will immediately pour our the top of the glass and flow down the sides of the cake.

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