2 oz/60 ml Pathfinder
1 oz/30 ml grapefruit juice
¾ oz/22.5 ml lemon juice
½ oz/15 ml 2:1 simple syrup
½ oz/15 ml egg white
Combine all ingredients in a cocktail shaker with ice cubes.
Shake well until cold.
Double-strain into a chilled cocktail glass.
Serve without garnish.