Easy Party Punch
["1 (46 oz.) can unsweetened pineapple juice", "1 (46 oz.) can apple juice", "2 (28 oz.) bottles 7-Up (or ginger ale), chilled"]
["Freeze pineapple juice", "and", "apple juice in their cans. One hour before", "serving, set out the frozen cans.", "When ready to serve, mix", "juices with chilled 7-Up.", "No additional ice is needed for the punch.", "Yield: 30 cups."]
["pineapple juice", "apple juice"]