Stir gin, syrup and lemon juice with ice in a rocks glass. Top off with tonic. Garnish with lemon twist and a sprig of tarragon
NB. St. Catherine brought tarragon to France, where it became one of the “fines herbes.”
- Tarragon syrup: dissolve 1/2 cup turbinado sugar in 1/2 cup boiling water; add a few sprigs of tarragon off the heat. Steep for 20 minutes.