A Negroni variant, named not for Cornwall in the UK, but for Cornwall-on-Hudson in the USA. Created by Philip Ward in 2006 after attending Gary "Gaz" Regan's Cocktails in the Country workshop in Cornwall-on-Hudson.
Half-fill a mixing jug with ice,
Add all ingredients and stir until well-chilled.
Strain into a chilled cocktail glass.
Garnish with a flamed orange twist.