Watermelon-Cucumber Agua Fresca

¼ cup fresh Key lime juice

3–4 pound seedless watermelon, peeled and cubed

1 cucumber, peeled and coarsely chopped

1 lime, cut into slices

Chile lime salt (optional)

In a blender, combine lime juice with ¼ cup water. Add watermelon and cucumber and blend until smooth, about 1 minute.

Pour mixture into a pitcher along with slices of lime. Refrigerate and serve cold.

If desired, rub one slice of lime around rims of glasses and dip rims in a small plate of chile lime salt.