Blueberry Granita with Liqueur

Rinse the blueberries briefly in a sieve and let them drain well.

Place the blueberries, lemon juice, powdered sugar, blueberry juice and blueberry liqueur in a tall container.

Puree everything until you obtain as smooth a liquid as possible.

Either freeze the mixture in an ice cream maker to make granita or pour it into a shallow metal bowl and place it in the freezer.

If freezing in the freezer, stir the mixture vigorously with a fork at regular intervals (every 30–45 minutes) during the first 3 hours to loosen the ice crystals, until a grainy granita forms.