Gomme syrup, also known as simple syrup or sugar syrup, is a sweetener used in many cocktails and mixed drinks. It is made by dissolving sugar in water, often in equal parts, and sometimes includes gum arabic to give it a smooth, silky texture. The addition of gum arabic differentiates gomme syrup from regular simple syrup by adding a slight viscosity, which can enhance the mouthfeel of a cocktail.

In the context of alcohol and cocktails, gomme syrup serves as a fundamental ingredient to balance acidity and add sweetness, ensuring flavors blend harmoniously. It is particularly essential in classic cocktails like the Old Fashioned, Whiskey Sour, and Mojito, where it complements the spirit's strength and the cocktail's other components, smoothing out any harsh edges and creating a well-rounded drink. Its clear appearance and neutral flavor make it versatile, allowing the primary flavors of the spirits and other ingredients to shine through.