Summerberry Cooler

In a blender, combine strawberries, the 1/2 cup raspberries, and the apple juice concentrate. Cover and blend until smooth. Pour mixture through a sieve into a small pitcher, pressing berries with a potato masher or back of a large metal spoon to extract all of the liquid. Discard pulp.

Slowly pour lemon-lime beverage into berry mixture; stir gently.

Serve in glasses over ice cubes. Garnish each serving with a small skewer threaded with additional raspberries.