Ingredients

• 1 Key lime (optional), quartered
• Kosher salt (optional) for rims of glasses
• 3/4 cup Cointreau or other orange-flavored liqueur
• 1/2 cup reposado tequila
• 1/2 cup fresh Key lime juice
• 2 teaspoons superfine granulated sugar (optional)

Instructions

1. Run a lime wedge (if using) around rim of each of 4 (6-to 8-ounces) glasses. Put salt (if using) on a small plate and dip glasses in salt to lightly coat rims.
2. Blend liqueur, tequila, juice, and sugar (if using) in a blender until combined. Serve over ice (in coated glasses).