Gomme, also known as gum syrup, is a sweetener used in cocktails instead of simple syrup. It is made by combining sugar and water with gum arabic, an all-natural resin harvested from the Acacia tree. Gum arabic is an emulsifier that prevents the sugar from crystallizing and gives gomme syrup a more viscous texture than simple syrup. Gomme syrup is commonly used in alcohol-dominant cocktails because it softens the alcohols flavor and adds a silky texture to drinks. It is also a popular option in coffee bars in Europe and parts of Asia, including Japan. Gomme syrup can be made at home by boiling and stirring sugar, water, and gum arabic together, and it can be stored in the refrigerator for about five to six months.