Blackberry Zinger Shakes

4 cups blackberries, fresh or frozen
1/2 (one-half) cup sugar
1 cup orange juice
4 cups frozen yogurt
2 cups crushed ice
Whole berries for garnish

Combine all ingredients in blender container and process until smooth. Pour into chilled glasses. Garnish with two or three reserved berries, if desired. Yields four servings.