Ingredients
Method
Pour some kosher salt on a small plate. Rub half the outer rim of a highball glass with 1 grapefruit wedge; roll moistened rim of the glass in salt. Reserve wedge.
Combine 2 oz. fresh grapefruit juice, ½ oz. fresh lime juice, and ¼ oz. simple syrup or 1 tsp. granulated sugar in salt-rimmed glass; stir until combined and sugar (if using) is dissolved. Add 2 oz. mezcal or tequila and fill glass with ice; stir until chilled, 30 seconds. Top with 2 oz. club soda, stir gently to combine, and garnish with the grapefruit wedge.