To make the strawberry jelly, transfer 3 envelopes of gelatin to a bowl. Dissolve with a half cup of hot water, strawberry extract, sweetener and red food coloring. When the mixture is completely melted, pour in half a cup of cold water. Stir together with a spoon or spatula before transferring to a rectangular container.
To make the lemon jelly, use a separate bowl for another 3 packets of gelatin. Pour half a cup of hot water in the bowl to dissolve the gelatin together with the sweetener, lemon extract, and green food coloring. Same with the strawberry jelly - add a half cup of cold water and mix well. Transfer to another rectangular container.
Chill the jellies in the fridge for 3 hours.
When the jellies are firm enough to be cut, remove from the molds and dice into little cubes. If the jellies are not firm after 4 hours in the fridge, dissolve a spoonful of gelatin in 3 tbsp of water. Add this in the mixture.
Start making the cream jelly by boiling a cup of boiling water and melting 4 packs of gelatin in it. Stir to dissolve entirely. Pour a cup of heavy cream in and stir continuously.
Arrange the jelly cubes in a ring-shaped container. Pour the cream in the mold and fill it up to the brim. Leave in the fridge for another 4 hours.
If ready to serve, simply take out from the mold and slice into wedges. Best eaten cold.