I found this recipe on thespruceeats.com.

gin, orange juice, absinthe, grenadine⁣
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This cocktail was created in the 1920s by Harry MacElhone, a famous bartender and cocktail book author. He named this drink after the pseudo-scientific idea that grafting monkey testicle tissue into humans was the key to health, vigor, and drive. This crazy idea was developed by the Russian doctor Serge Voronoff.⁣
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Okay.⁣
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Apparently, ol’ Harry named the drink Monkey Gland because it was a hot topic that might draw in some customers. Even the New York Times ran a story titled, “MONKEY GLAND, LATEST COCKTAIL”. Geez.⁣
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So. Weird.⁣
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I added absinthe to my bar. 🧚‍♂️ I don’t really like anise flavor, but everything I read about this drink is about getting the balance right. I only swirled the absinthe in the empty glass before pouring. And it worked! There is only a hint of anise flavor, and it is balancing beautifully. Yummy pink drink. You know me and my love of Prohibition-era gin drinks. ⁣