STIR all ingredients with ice and strain into chilled glass.
Orange zest twist
Simple but very tasty, equal parts old tom gin and sweet vermouth with aromatic bitters.
Adapted from George Winter’s 1884 How To Mix Drinks–Bar-Keeper’s Handbook. His original recipe calls for “Peruvian bitters” - we found 3 dashes of Peruvian Cortesano Amargo Bitters Aromatic work well if you have them, alternatively use a dash less of Angostura aromatic bitters.