The recipe for the plum cocktail:

2 oz Vodka

3/4 oz St. Germain

3/4 oz plum & rosemary syrup  (recipe below)

1/5 oz lemon juice

Shake and pour into a rocks glass and top with a little club soda

Plum & rosemary syrup:

2 cups water

1 cup sugar

18 plums, peeled and chopped

4 sprigs rosemary.

Bring the entire thing to a slow boil and then reduce it to a simmer until the plums have cooked down to a syrup. Stir somewhere between “constantly” and “often” because you don’t want to burn it. Remove the rosemary before you pour the syrup into a jar.