The Sandia Mountains, just east of Albuquerque, turn a unique shade of pink on summer evenings—it’s kind of a dusky alpenglow (sandia is Spanish for watermelon). This inspired my New Mexican wife to invent a perfect summer cocktail: Muddle a cup of watermelon in a 12-ounce glass. Squeeze half a lime. Add a jigger or two of tequila, to your taste. Drop in an ice cube, top off with soda, serve with a spoon. Happy summer!