A gin and tonic is a classic and easy highball cocktail made with gin and tonic water. Usually, the water is poured over a large amount of ice. The exact ratio of gin to tonic varies according to taste and the strength of the gin. Most recipes have a ratio between 1:1 and 1:3. The most used garnish is a slice or wedge of lime. A bar spoon can be used to keep the effervescence. The ice chills the gin, dulling the effect of the alcohol in the mouth and causing the drink more pleasant and refreshing to taste at any time of the day you want.