Duchamp’s Kris von Dopek, the mixologist featured in this week’s Cocktail Challenge, recently created some pre-Prohibition cocktails in honor of Plymouth Gin’s reissue of Thomas Stuart’s 1896 manual Stuart’s Fancy Drinks and How to Mix Them, a slim volume not available commercially. The contents, as announced on the frontispiece: “Clear and practical directions for mixing all kind of cocktails, sours, egg nog, sherry cobbler, coolers, absinthe, crustas, fizzes, flips, juleps, fixes, punches, lemonades, pousse cafe, invalids’ drinks, etc. etc.” The book starts with instructions for making absinthe, cautioning, “Never use absinthe in any preparation unless ordered by the customer.” The customer is also always right when it comes to “Arf and Arf,” aka a black and tan: “This is a common English drink and means half porter and half ale, but in this country we use half old ale and half new. It is always best to ask the customer how he desires it.”