Photo and Ingredients via Whole Foods Market
6 cups 1-inch cubes seedless watermelon (from about a 5-pound melon)
1 (10-ounce) bottle lemon juice
3/4 cup sugar
Mint sprigs, for garnish
1. Working in batches as necessary, purée watermelon and lemon juice in blender until smooth and then transfer to a large container.
2. Add 6 cups water and sugar and stir until dissolved.
3. Pour over ice in tall glasses, garnish with mint and thin slices of watermelon, if desired, and serve.