1½ oz rye whiskey½ oz black blended Jamaican rum¼ oz rich Demerara syrup (2:1)½ tsp grenadineHandful of mint
instructions :

Add all the ingredients to the julep tin and muddle the mint gently with tsp.

Add 2 cubes of cracked ice, stirring to chill. Add crushed ice to fill halfway; let chill. Add more to fill. Garnish.

source :
imbibemagazine.com