Place all ingredients in the mixing bowl and whip them together for about 3-4 minutes, until homogenous and fluffy. Place the mixture in a silicon mold (or inox mold) and let it set in the freezer for 3-4 hours minimum. Assembly  Place a layer of a sponge cake on the bottom of a cake ring and half fill in with lemon semifreddo. Place one more sponge cake layer and fill the rest of the ring with the semifreddo. Place it in the freezer for an hour. Take semifreddo off the mold and cover it with Crystal Mirror Lemon. Use also Crystal  Mirror Forest Fruits and chocolate decorations.