Rim: Add some kosher salt to a small plate. Rub a lime wedge along the edge of your glass and then turn upside down in the salt to coat the rim.
Make Cocktail: Add 2-3 ounces fresh grapefruit juice, 2 ounces tequila, 2 ounces club soda and ½ ounce simple syrup to the glass. Add ice cubes and stir.
Serve: Garnish with a grapefruit wedge and enjoy!
Notes
Grapefruit Juice: if you don't have fresh grapefruit juice feel free to use store-bought, the color might be a little darker.