The sour is a classic family of cocktails that also includes the Margarita and the Daiquiri. The classification was first written down in Jerry Thomas’ 1862 book, How To Mix Drinks, which is quite possibly the most iconic cocktail book of all time and a must-read for anyone with an interest in mixed drinks.
As a general rule, sours contain a base liquor, lemon or lime juice, and a sweetener. Occasionally they can contain egg white, as the Gin Sour does. You can also add a few dashes of bitters to enhance the flavours of the cocktail.
1 egg white
Add all ingredients into a cocktail shaker, with cubed ice. Vigorous shake. Then dry shake again without ice. and fine strain into glass.