Watermelon Paloma

Place watermelon into a blender. Cover and blend in batches until smooth. Strain through a fine-mesh sieve set over a bowl; discard pulp. Cover and refrigerate juice for 2 hours or until chilled.

For drinks, combine turbinado sugar and kosher salt in a shallow dish. Rub rims of 8 (10-oz. each) cocktail glasses with lime wedges; dip in sugar mixture and set aside. Add 6 cups watermelon juice to a large ice-filled pitcher; reserve any remaining juice for another use. Add grapefruit juice, tequila, and fresh lime juice to pitcher; stir to combine.

To serve, fill prepared glasses with ice. Pour watermelon mixture into prepared glasses. Garnish with grapefruit slices and fresh mint, if desired.