1⁄2 c Pineapple (slices, muddled)
              1⁄4 t Tartaric acid powder
              4 oz Gin, Plymouth Navy Strength
              3 oz Amaro Sibilla
              2 oz Apricot liqueur
              4 oz Milk (whole, warm)
          Instructions
    
          Acidify the muddled pineapple with the tartaric acid, add the remaining liquors, wait 5 minutes, strain into the milk, stir and let sit 5 minutes to curdle. Strain through a damp Chemex filter into a carafe - it's best to do this in the refrigerator overnight. Transfer to a jar and label.
Notes
    
          This makes the Sibilla taste like coffee so that the overall effect is like drinking an espresso then pouring in a glass of good Jamaican rum.