The original recipe comes from Harry Craddock’s 1930 tome The Savoy Cocktail Book. Mixologist gaz regan polished it up a bit with improved ratios, and suggests trying it as highball too, by adding a half-part more gin and serving in an ice-filled tall glass with extra orange juice.
Fun fact: Rapper Snoop Dogg is a holder of the Guinness Book Of World Records title for “Largest Paradise Cocktail,” after presenting a 500-liter version of the cocktail at the Bottle Rock Napa event in 2018.