3-4OuncesTequilaDepending on your preference level
Kosher SaltFor rim (optional)
First, make simple syrup which is equal parts sugar to water. Heat 1/2 cup water and ½ cup granulated sugar in a saucepan until sugar is dissolved. Let cool before adding to drink mixture. Leftovers can be stored in the refrigerator.
Juice the grapefruit and lemon. Add in tequila, simple syrup, and sparkling water.