This recipe for the Blue Moon comes form a book called Crosby Gaige’s Cocktail Guide and Ladies’ Companion, 1941 (I know this because of a wonderful book titled Vintage Spirits and Forgotten Cocktails, by Ted Haigh). However this is not the first recipe. The Blue Moon appears first in Hugo Ensslin’s Recipe for Mixed Drinks, 1917, but uses dry vermouth in lieu lemon juice and adds orange bitters. I prefer Gaige’s.
A cocktail with a similar name, The Blue Train can be found in the Savoy Cocktail Book, 1930, which consists of gin, Cointreau, lemon and 1 dash of blue vegetable extract - essentially a White Lady with dye. I’m going stick with this one…
The Blue Moon
Shake and strain into a chilled cocktail glass. Garnish with a lemon twist.