01 - Pour 1½ cups of the fruit juice into a medium saucepan.
02 - Sprinkle the gelatin evenly over the juice and let it bloom for 5 minutes.
03 - Gently heat the mixture on low, stirring constantly, until the gelatin dissolves completely (do not boil).
04 - Remove from heat. Stir in the remaining ½ cup cold juice and honey or maple syrup, if using. Let the mixture cool to lukewarm (not hot).
05 - Once cooled (below 100°F/38°C), whisk in the probiotic yogurt or probiotic powder.
06 - Pour the mixture into silicone molds or a glass baking dish.
07 - Refrigerate for at least 2 hours, or until fully set.
08 - Unmold or slice into cubes, and keep refrigerated until serving.