Graduation Punch
["4 qt. water", "4 c. grapefruit juice", "3 (6 oz.) cans frozen lemonade concentrate, thawed and undiluted", "3 (6 oz.) cans frozen limeade concentrate, thawed and undiluted", "1 3/4 c. sugar", "2 (1 liter) bottles ginger ale, chilled", "fresh strawberries and lime slices (garnish)"]
["Combine first 5 ingredients; stir well.", "Pour mixture into a large freezer container or into 2 (13 x 9 x 2-inch) dishes; cover and freeze until firm.", "Partially thaw mixture; break into chunks and transfer to a punch bowl.", "Gently stir in ginger ale just before serving.", "Garnish.", "Yields 2 1/4 gallons."]
["water", "grapefruit juice", "frozen lemonade concentrate", "frozen limeade", "sugar", "bottles ginger ale", "fresh strawberries"]