Toppy’s Nine Ball

1 1/2 oz Worker’s No. 9
1/2 oz Lemon Juice
1/2 oz Giffard Grapefruit Liqueur
1/2 oz St Germain Elderflower
Dash Regan’s orange bitters

Fall a rocks glass with ice cubes. Add all ingredients. Stir

Optional Substitutions: Grapefruit Juice