2 teaspoons sugar 1 lime wedge 3 1/2 cups cubed seeded watermelon 1/2 cup tequila 2 tablespoons sugar 3 tablespoons fresh lime juice 1 tablespoon Triple Sec (orange-flavored liqueur) Lime wedges or watermelon balls (optional)

1. Place 2 teaspoons sugar in a saucer. Rub the rims of 6 glasses with 1 lime wedge; spin rim of each glass in sugar to coat. Set prepared glasses aside.
2. Combine watermelon and next 4 ingredients (through Triple Sec) in a blender; process until smooth. Fill each prepared glass with 1/2 cup crushed ice. Add 1/2 cup margarita to each glass. Garnish with lime wedges or melon balls, if desired.