"This showstopper cake is as delicious to eat as it is pretty to look at. Cubes of jelly are suspended in a creamy jelly and set in a mould, creating a stained glass effect. Use ready-made jelly pots to save some time."
Place each gelatin mix in a separate bowl; stir 1/2 cup boiling water into each until completely dissolved, about 2 minutes. Stir 1/2 cup cold water into each gelatin mix; refrigerate until completely set, 4 hours to overnight.
Grease a 9-inch cake pan or use a silicone mold. Slice the chilled gelatin into cubes and gently toss together; tip into the prepared cake pan.
Pour 1 cup cold water into a bowl and sprinkle unflavored gelatin over water; let sit until dissolved, 2 to 3 minutes. Add 1 cup boiling water and stir until gelatin is dissolved.
Pour sweetened condensed milk into a blender or food processor. Fill the condensed milk can with double cream and add to the blender with the unflavored gelatin mixture and vanilla extract. Blend mixture until well combined; pour over gelatin cubes in the cake pan. Evenly distribute milk mixture using a spatula.
Refrigerate until set, 4 hours to overnight. Run a knife along the sides of the mold and invert cake onto a plate.
If you don't have powdered gelatin to hand, you can use leaf gelatin. Use the number of leaves needed to set 4 1/2 cups of liquid. Depending on the type of leaf gelatin you have, you will need somewhere around 12 leaves. Follow the packet instructions to dissolve the gelatin leaves before adding to the milk and cream mixture.
Per Serving: 391 calories;16.3 g fat;
54.5 g carbohydrates;
8.4 g protein;
10 mg cholesterol;
154 mg sodium.