Chilled Blueberry Soup

4 cups fresh or frozen blueberries
3 cups water
2/3 cup sugar
1/4 teaspoon ground allspice
1 carton (16 ounces) plain yogurt
Sour cream or additional yogurt, optional

In a large saucepan, combine the blueberries, water, sugar and allspice. Bring to a boil, stirring occasionally. Remove from the heat.

In batches, process blueberry mixture and yogurt until smooth. Cover and refrigerate until chilled. Serve with sour cream or yogurt if desired. Makes 6 servings.