A gin and tonic is a highball cocktail made with gin and tonic water poured over ice. It is usually garnished with a slice or wedge of lime. The amount of gin varies according to taste. Suggested ratios of gin to tonic are between 1:1 and 1:3. In some countries (e.g. UK), gin and tonic is also marketed pre-mixed in single-serving cans. In the United States, most bars use "soda out of a gun that in no way, shape or form resembles quinine water", according to bartender Dale DeGroff. To get a real gin and tonic, DeGroff recommends specifying bottled tonic. Alternatively, one can add tonic syrup to soda water. The drink is a particular phenomenon as its taste is quite different from the taste of its constituent liquids which are rather bitter. The chemical structures of both ingredients are of a similar molecular shape and attract each other, shielding the bitter taste. It is commonly referred to as a "G and T" in the UK, US, Canada, Australia, New Zealand and Ireland. In some parts of the world, it is called a "gin tonic" (e.g. Germany, Spain, the Netherlands, Japan ジン・トニック – phonetically "gin tonic"). Some brands will replace the word "gin" with their own brand or initial in recipes. For instance, "Sapphire and Tonic" for Bombay Sapphire, "Hendrick's and Tonic" for Hendrick's Gin (garnished with cucumber to further distinguish it), or "T&T" for Tanqueray.