Raspberry Lemonade

2 cans (12 oz. each) frozen lemonade concentrate, thawed
2 pkgs. (10 oz. each) frozen sweetened raspberries, partially thawed
2 to 4 tablespoons sugar
2 liters club soda, chilled
Ice cubes

In a blender, combine lemonade concentrate, raspberries and sugar.  Cover and process until blended.  Strain to remove seeds.  In a 4 1/2 qt.container, combine raspberry mixture, club soda and ice cubes; mix well.  Serve iimmediately. 
Yield:  3 1/2 quarts.