For Each Margaritas
3 oz freshly squeezed grapefruit juice (about 1/2 large grapefruit)
1 oz fresh lime juice (about 1 large lime)
1 1/2 oz silver tequila
1/2 oz orange liqueur, such as triple sec or Grand Marnier™
Splash club soda
Rims and Garnish
1 part kosher salt
1 part granulated sugar
Lime wedges, for garnish
Small grapefruit wedges, for garnish
Begin by preparing the glasses: Place the sugar and salt on a small plate. Run a lime wedge around the edge of the glasses to moisten them, then tap the edges of the glass in the sugar/salt mixture so it sticks. Fill with desired amount of ice and set aside.
In a cocktail shaker or lid with a tightly fitting jar, add the lime juice, grapefruit juice, tequila, and triple sec. Top off the shaker with ice, then close the lid and shake vigorously. Strain margarita into the prepared glasses, then top with a splash of club soda. Garnish with lime and grapefruit wedges. Enjoy immediately.