Orange Breakfast Sipper

6 Cups buttermilk
2 (6-ounce) cans frozen orange juice concentrate
1/4 Cup brown sugar
2 Teaspoons vanilla
8 to 12 large ice cubes
In a blender container combine buttermilk, orange juice concentrate, brown sugar, and vanilla. Cover and blend till smooth. Add ice cubes one at a time. Blend until smooth and frothy. Makes 8 servings