
Bloom the gelatin: Pour cranberry juice into a saucepan. Sprinkle gelatin over the surface. Let it bloom for 5 minutes.
Heat and stir: Turn heat to low. Gently warm and whisk until gelatin fully dissolves. Do NOT boil.
Add lemon: Remove from heat and stir in lemon juice.
Pour into mold: Pour mixture into silicone molds or a glass dish.
Chill: Refrigerate for at least 2 hours, or until fully set.
Serve: Cut into cubes and enjoy. Store in the fridge for up to 5 days.