Begin by boiling 1 cup of water in a saucepan.
In a separate bowl, mix the gelatin with 1 cup of cold water.
Add the boiling water to the gelatin mixture and stir until fully dissolved.
Incorporate the fruit juice and sugar into the mixture.
Allow the mixture to cool slightly before adding mixed fruits.
Pour the mixture into a cake mold or a shallow dish.
Place in the refrigerator to chill for at least 4 hours.
Once set, carefully remove the jelly cake from the mold.
Top with whipped cream before serving.
Slice and enjoy your colorful jelly cake!