Rub the rim of a rocks glass with the lime wedge. Spread the salt on a small plate large enough for the rim of the glass. The salt should be about 1/4 inch deep. Dip the rim of the glass into the salt to coat. Do not oversalt. Set the glass aside.
Pour the tequila, Triple Sec, lime juice, lemon juice, and simple syrup into a cocktail shaker. Fill the shaker with ice, cover, and shake vigorously 20 times. Fill the rocks glass with ice, strain the drink over the ice, and serve.
Notes
How to Make Simple Syrup:
Take 2 parts sugar and 1 part water.Bring the water to a boil. Dissolve the sugar into the boiling water, stirring constantly. Once the sugar is dissolved completely, remove the pan from the heat. (Note: Do not allow the syrup to boil for too long or the it will be too thick.) Allow to cool completely and thicken, then use it or bottle it.