Why a Negroni is equal parts, and how far you can bend the rule

The Negroni is one rule: equal parts gin, red bitter and sweet vermouth, stirred over ice. Bitter and sweet pull against each other and the gin holds the middle, so every part stays audible.

Slide the ratio, watch the glass fill and see how strength and units change. Learn why stirring adds a fourth ingredient, and how to make a lighter or alcohol-free version.