1¼ ounces Peanut Butter-Infused Linie Aquavit (see Note)
¼ ounce Smith & Cross Jamaican rum
¾ ounce Carpano Antica vermouth
½ ounce Campari
1 teaspoon Giffard Banana liqueur
Stir all the ingredients with ice, then strain into a double old-fashioned glass over 1 large ice cube. No garnish.
Note: To make Peanut Butter-Infused Linie Aquavit, combine one 750ml bottle Linie aquavit with 40 grams creamy peanut butter in a blender and blend until smooth. Transfer to a bowl, cover, and freeze for 12 hours. Carefully poke a hole in the solidified peanut butter and drain the liquid out. Strain the liquid through a paper coffee filter or fine-mesh sieve lined with several layers of cheesecloth, then funnel back into the aquavit bottle and refrigerate until ready to use, up to 1 month.