Sours are aptly named drinks. Their flavour comes from either lemon or lime juice, which is balanced with sugar.
Sours can be based on practically any spirit but the bourbon based Whiskey Sour is by far the most popular. Many (including us) believe this drink is only properly made when smoothed with a little egg white.
Sours are served either straight-up in a sour glass (rather like a small flute) or on the rocks in an old-fashioned glass. They are traditionally garnished with a cherry and an orange slice, or sometimes a lemon slice.
Gin Sour (Difford's)
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This 4:2:8 formula is a tad sourer than the classic sour proportions of 3:4:8: three-quarter part of the sour ingredient (lemon juice), one part of the sweet ingredient (sugar syrup) and two parts of the strong ingredient (gin).