Princeton
Orange zest twist
STIR all ingredients with ice and strain into chilled glass.
[['6 cl', 'Portobello Old Tom gin'], ['1.5 cl', 'Tawny port'], ['0.5 cl', 'Sugar syrup (65.0°brix, 2 sugar to 1 water rich syrup) (optional)'], ['3 dash', 'Orange Bitters by Angostura'], ['1 cl', 'Chilled water']]
[['6 cl', 'gin'], ['1.5 cl', 'tawny port'], ['0.5 cl', 'sugar syrup'], ['3 dash', 'angostura'], ['1 cl', 'chilled water']]