- 8 cups cubed seeded watermelon, divided
- 1 cup water, divided
- 1/3 cup sugar, divided
- 1/4 cup fresh lime juice
- 1 liter club soda or seltzer water, well chilled
- Lime slices for garnish
- Combine half the watermelon, half the water and half the sugar in a blender; puree. Pour through a coarse strainer into a large container. Repeat with the remaining watermelon, water and sugar. Stir in lime juice. Refrigerate until well chilled, about 4 hours.
- To serve, stir in club soda (or seltzer) and garnish with lime.