Fill a rocks glass to the top with ice cubes
Pour 0.75 oz of quail egg white, 1 oz of lemon juice, 0.75 oz of butterscotch syrup, 0.75 oz of rhubarb liqueur and 1 oz of dark rum into a shaker
Add 1 dash of Angostura bitters
Fill the shaker with ice cubes and shake
Strain into the rocks glass
Garnish with halves of a lemon wedge