2 cans (6 oz.) frozen limeade concentrate, thawed
2 bottles (28 oz.) ginger ale, chilled
2 bottles (28 oz.) tonic water, chilled
1 c. grenadine

In a 6 quart non-metal container, combine all ingredients just before serving. Serve over ice. Garnish with lime slices and mint leaves, if desired. Serves 16 (1 cup).