Gum Syrup, also known as gomme syrup, is a sweetener used in cocktail making. It is a sugar syrup that includes gum arabic, a natural gum made from the sap of acacia trees, which adds a silky, smooth texture to the syrup. Gum syrup is particularly valued in classic cocktails for its ability to add not only sweetness but also a luxurious mouthfeel, making it superior to plain simple syrup in many bartenders' eyes. It’s often used in spirit-forward cocktails like an Old Fashioned or a Whiskey Sour to enhance the drink’s body and integrate the flavors more smoothly.