A friend of ours who was a teenager in London during the Blitz said they'd drink this in the bomb shelters because it could be mixed in the dark.
2 oz. dry gin or Plymouth gin
1 oz. sweet (er, red) Vermouth
Serve over ice in an Old Fashioned glass or shake with ice and serve up in a chilled glass or even serve at room temperature in winter-time. No twist, bitters, or special gin or spirits are necessary. Add them if you want, but why bother.