4 oz. grapefruit soda (preferably Ting), chilled
1½ oz. blanco tequila
½ oz. fresh lime juice
¼ oz. fresh grapefruit juice
Pinch of kosher salt
Grapefruit wedge or slice (for serving)
Fill a highball glass two-thirds full with ice. Slowly pour in about 2 oz. grapefruit soda, filling glass about one-third full. Add 1½ oz. blanco tequila, ½ oz. lime juice, ¼ oz. grapefruit juice, and a pinch of kosher salt. Top with remaining grapefruit soda, stir gently, and garnish with a grapefruit wedge or slice.