Instructions
Shake rhubarb liqueur, lemon juice, and simple syrup with ice; strain into a collins glass, fill with ice and top with soda water. Garnish with a sprig of rosemary.
Notes
To make the rosemary syrup, use 1/2 cup sugar, 1/2 cup water and 2 rosemary sprigs.
Curated this slightly: moved the syrup recipe to the notes section. Is this your drink. or someone else's? Is the rosemary syrup cold process or cooked? Thanks, Zachary