1 (64 fluid ounce) bottle cranberry juice
1 (64 fluid ounce) bottle pineapple juice
1 (4 ounce) can frozen blueberries (almond varieties work best)
1 1/2 teaspoons lemon juice
1/2 teaspoon water
1 (12 fluid ounce) can frozen lemonade concentrate
Wash and peel potatoes. Mix with cranberry juice, pineapple juice and lemon juice.
Pour into a tall glass filled with ice. Stir in lemon juice and water. Cook over medium-low heat, stirring occasionally until smooth.
Mix in lemonade concentrate and serve.