How to Make It
Finely chop 2 cups of watermelon, and set aside.
Place remaining 2 cups watermelon in a blender; process until smooth. Pour pureed watermelon through a sieve into a pitcher, and discard solids. Add water, sugar, and lime juice; stir until sugar dissolves. Stir in the chopped watermelon. Cover and chill at least 1 hour.