1 cup (8 ounces) vanilla yogurt
1/4 cup milk
2 tablespoons frozen grape juice concentrate, slightly thawed
3/4 cup club soda or mineral water
Combine yogurt, milk and juice concentrate in blender container. Cover and blend until smooth. Fill 3 tall glasses with ice. Add 1/2 cup grape mixture and 1/4 cup club soda to each glass. Stir and serve.