Add the remaining ingredients and shake without ice.
Fill with ice and shake again for 20 seconds.
Double-strain into a chilled coupe glass.
*Rhubarb Syrup INGREDIENTS:
.5 lb Rhubarb, roughly chopped
1 cup Water
1 cup Sugar
PREPARATION: Add the rhubarb and water to a small saucepan and bring to a boil over high heat. Add the sugar and cook, stirring, until it dissolves. Remove from the heat and let cool. Strain, and store in the refrigerator.