You can't really argue with Gaz Reagan, who once said ‘you can slap my wrist and call me Deborah if it doesn’t also work no matter what ratios you use’, but to make the perfect Negroni you want to use.
30ml (1oz) of Four Pillars Gin
30ml (1oz) Casa Mariol Negre (Vermouth)
30ml (1oz) Campari
Orange peel to garnish