Ingredient
Measure
Campari (Italian red bitter)
45 ml (1½ oz)
Freshly squeezed orange juice
120 ml (4 oz), about one large orange
Ice
Cubes to fill a highball
The ratio most bars use: roughly 1 part bitter to 2.7 parts juice. Difford's Guide adds 2.5 ml of rich syrup; many bars leave it out.