Watermelon Lemonade

6 cups 1-inch cubes seedless watermelon (from about a 5-pound melon)     
1 (10-ounce) bottle lemon juice     
3/4 cup cane sugar     
Crushed ice     
Mint sprigs, for garnish     

 

Working in batches as necessary, purée watermelon and lemon juice in blender until smooth; transfer to a large container. Add 6 cups water and sugar; stir until dissolved. Pour over ice in tall glasses, garnish with mint and thin slices of watermelon, if desired, and serve.

 

recipe source here