A bit o' history
Created in 1930 at Los Angeles' Vendôme Club and named for the famous hat-shaped Brown Derby restaurant chain, then a popular celebrity hangout. An earlier variation, sometimes called the Brown Derby No. 1, called for dark rum, lime juice, and maple syrup or maple sugar. It also appears in Harry Craddock’s classic 1930 The Savoy Cocktail Book as the De Rigueur Cocktail.