I remember being taught there are only 9 cocktails worth making or drinking; every barman should make them perfectly and uniformly. The Negroni is one of them.
Negroni:
2 parts Bombay Sapphire
1 part Campari
1 part sweet vermouth
Stir over ice. Pour into chilled rocks glass with large cubes of ice and long twist of orange peel. Some say to stir the drink with the peel but I like the oils slowly releasing and chilling the peel too much stops it.
The other 8 (I was told) are:
Old Fashioned
Cosmopolitan (proper one, not sickly sweet versions)
Long Island Iced Tea
Caipirinah
Martini (and variations)
White Russian
Bloody Mary
G&T