The Caruso is a storied historical cocktail dating back to 1907, but the version of it that survives today hinges on cringe-inducing artificially-flavored liqueur. This version takes us back to a time when mixology was an art and mint was made from, well, mint. Begin by making a mint simple syrup. To do so, chop 1.5 cups of mint into 1 cup of water and bring to a boil. Once boiling, stir in 1 cup of sugar until it is dissolved completely. Let cool, then strain out solids. This syrup will keep refrigerated for some time. To mix the cocktail, combine 2 ounces of Juniper Green Gin with 1 ounce of dry vermouth in a shaker with ice. Sweeten to taste with the mint simple syrup. Stir and pour into a lowball glass over ice, garnished with a mint leaf.