Combine Dubonnet Rouge, gin, and bitters in a mixing glass.
Fill with ice and stir for approximately 20–25 seconds until well chilled and diluted.
Strain into a chilled cocktail glass.
Express a lemon peel twist over the surface, run it around the rim, and drop it into the glass.
Queen Elizabeth The Queen Mother was so devoted to this drink that Buckingham Palace reportedly kept Dubonnet and gin stocked at all times; the traditional ratio leans heavier on the Dubonnet, giving it an unusually wine-forward character for a stirred cocktail.
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