Demerara syrup is a sweetening agent made from Demerara sugar, a type of raw cane sugar that originates from the Demerara region of Guyana. Known for its large, amber-colored crystals and rich, molasses-like flavor, Demerara sugar adds a distinctive depth and complexity to the syrup. The process of making Demerara syrup involves dissolving the sugar in water, typically in a 1:1 or 2:1 sugar-to-water ratio, over low heat until fully integrated. This results in a thick, flavorful syrup that retains the nuanced flavors of the original sugar.

In the context of cocktails, Demerara syrup is prized for its ability to enhance and complement the flavors of spirits, particularly those with bold profiles such as rum, whiskey, and bourbon. Its robust, slightly caramelized taste can add an extra dimension to classic cocktails like the Old Fashioned, Dark 'n' Stormy, and Mai Tai. Bartenders often choose Demerara syrup over regular simple syrup when they want to introduce a richer, more complex sweetness to their creations, making it a versatile and valuable ingredient in the mixology world.