A gin and tonic is a highball cocktail made with gin and tonic water, usually garnished with a slice of lime or lemon and often served over ice. The ratio of gin to tonic water can vary considerably, from a glass of gin with a splash of tonic to one part gin for every five parts tonic.
Serve on the rocks, poured over ice using a citrus fruit to garnish.
1 part Gin
1-3 parts tonic water, to taste
Mix and serve stirred, not shaken.