The Singapore Sling was created at Raffles Hotel (in, naturally, Singapore) at the turn of the 20th century by bartender Ngiam Tong Boon. Visit the hotel today, and you see the safe in which Ngiam locked away his recipe books, as well as the Sling recipe hastily jotted down on a bar chit in 1936 by a hotel visitor who had asked a waiter for it.
1 oz. London dry gin
1 oz. Bols Cherry brandy or Cherry Heering
1 oz. Bénédictine
1 oz. fresh lime juice
2 oz. soda water
1 dash Angostura bitters
Combine all ingredients except soda water and bitters in an ice-filled glass. Top with soda water, stir briefly and dash with Angostura bitters. Note: The original Singapore Sling appears to have been ungarnished. By the mid-1920s, they were adding the peel of a lime, cut in a thick spiral. By the late ’30s, they were also omitting the Bénédictine and bitters and floating Sloe Gin on top.