Old Hickory (Britten's recipe)
Grapefruit zest twist
STIR all ingredients with ice and strain into ice-filled glass.
[['4.5 cl', 'Antica Formula or other well aged sweet vermouth'], ['3 cl', 'Martini Extra Dry vermouth'], ['4 dash', "Peychaud's or other Creole-style bitters"], ['2 dash', 'Orange Bitters by Angostura']]
[['4.5 cl', 'sweet vermouth'], ['3 cl', 'dry vermouth'], ['4 dash', "peychaud's bitter"], ['2 dash', 'angostura']]