Homemade falernum syrup

Daniele Dalla Pola, recipe sufficient for 750 ml: Use a jar or a bottle to mix 180 ml overproof dark rum, 90 g of ginger root grounded in a blender, zest of 9 Limes , 40 cloves, 180 g of almond paste and 1/2 bar spoon of almond extract. Infuse for 24 hours and then strain into a clean container, pressing out all the liquid. Add 420 ml of homemade sugar syrup (2:1), and 90 ml of lime juice. Shake well until the mixture is yellow-green.