In shaker filled with hard ice squeeze lime. Add simple syrup. Add Tequila. Add triple sec. Or, for a warmer, more full taste, substitute Grand Marnier. Shake briskly to chill the mixture and strain into a chilled cocktail shell that has been lightly rimmed with grained salt (Kosher) Moisten the rim with fresh lime when salting). Add a squeeze of fresh lime and enjoy.
Serve in a Cocktail Glass