Pink gin is a cocktail made fashionable in England in the mid-19th century, consisting of Plymouth Gin and a dash of Angostura bitters, a dark red bitters that makes the whole drink pinkish. Lemon rind is also commonly used as a garnish, with the citrus essential oils subtly complementing the flavour.
Pink gin is widely thought to have been created by members of the Royal Navy. Plymouth gin is a 'sweet' gin, as opposed to London gin which is 'dry', and was added to Angostura bitters to make the consumption of Angostura bitters more enjoyable as they were used as a treatment for sea sickness in 1824 by Dr. Johann Gottlieb Benjamin Siegert.
The Royal Navy then brought the idea for the drink to bars in England, where this method of serving was first noted on the mainland. By the 1870s, gin was becoming increasingly popular and many of the finer establishments in England were serving pink gins.
Chill the cocktail glass.
Add three dashes of aromatic bitters to the glass and coat the inside.
Add the gin and chilled water.
Garnish with the lemon twist.