Step 1

Grease a 9-inch square pan (or any size/shape pan that you like) with cooking spray and line it with parchment paper for easier jello removal later.

Step 2

Pour the fruit juice into a small saucepan, and add in the agar agar flakes. Bring the juice to a boil, and whisk constantly to help the agar flakes dissolve. Once the juice is boiling the flakes have completely dissolved, remove the mixture from the heat.

Step 3

Pour the liquid into the lined dish, then transfer the dish to your refrigerator to set. It will take up to 2 hours to cool completely. Slice into squares and serve chilled.