Gum syrup is a rich simple syrup (2:1 sugar:water) combined with gum Arabic, an all-natural resin harvested from the Acacia tree and found primarily in Northeast Africa. Gum Arabic is essentially a hardened sap that can either be heated, melted and dissolved into a liquid, or powdered from its dried state for easier dissolution. Gum Arabic has been harvested and used for centuries for its various natural properties, and has been a feature ingredient in cocktails for over 150 years.