2 oz El Rey Hibiscus Silver Tequila
½ oz Dry Curaçao
½ oz Fresh Lime Juice
2 oz Fresh Grapefruit Juice
¾ oz Simple Syrup
Add all ingredients except club soda to a shaking tin and then add ice. Shake well, strain over ice into a Collins glass and top with club soda. Garnish with a slice of grapefruit and add a straw.