Fresh Berry Terrine

Bahan-bahan (8 porsi)

• 1¼ lbs mixed berries, (such as blueberries, raspberries, blackberries, and strawberries (cut the strawberries in half))
• 2 cups white grape juice, (best quality, divided)
• 2 (¼-oz) packets unflavored gelatin
• 3 tablespoons sugar