Gomme syrup is a classic cocktail ingredient used instead of simple syrup to give drinks a light froth and velvety mouthfeel. In this updated version, I cut down the gum Arabic proportion to make the recipe a little cheaper for the home bartender.
'gomme syrup' on Serious Eats
Once upon a time, simple syrup wasn't so simple. Instead of using a mixture of just sugar and water, old timey barkeeps would sweeten cocktails with a more viscous sweetener known as gomme or gum syrup.
A little extra effort to make gomme instead of simple syrup will give your cocktails a silky texture you can't get from plain simple syrup.