Watermelon Punch

6 cups cubed, seeded watermelon
1/3 cup Simple Syrup (recipe follows)
1 12-oz. can frozen lemonade concentrate, thawed
2 cups unsweetened pineapple juice
Crushed ice

Combine watermelon and simple syrup in food processor or blender, and blend until smooth. Push mixture through wire-mesh strainer, discarding solids. Return watermelon syrup to blender, add lemonade concentrate and pineapple juice, and blend well. Serve over crushed ice.

SIMPLE SYRUP:

1 cup water
½ cup sugar

Cook water and sugar over low heat until sugar dissolves. Bring to a boil, reduce heat, and summer 1 minute. Remove from heat and cool. Store in refrigerator.