1 1/2 oz of Tequila
1 oz of orange liqueur
1/2 oz of Aperol
3/4 oz of Lime Juice
1 twist of grapefruit peel
2 oz of soda water
Shake with ice and strain into a salt-rimmed Collins glass filled with ice. Top with ~2 oz soda water and garnish with a 3-inch swath of grapefruit peel.