Berry Granita

Directions

1. 1
   In a small pot over medium heat, combine the water and sugar substitute.
2. 2
   Bring to a boil.
3. 3
   Boil for 2 minutes, then set aside to cool to room temperature.
4. 4
   In a food processor fitted with a metal blade, combine the blueberries, lemon peel, lemon juice, and cooled syrup.
5. 5
   Pulse for 2 minutes, or until the blueberries are coarsely ground.
6. 6
   Pour into a small metal bowl and stir a few times with a fork to break up any large pieces.
7. 7
   Cover the bowl with foil and place in the freezer overnight.
8. 8
   Spoon into 6 serving glasses, garnish with a lemon twist, and top with the whipped topping, if using.