Kithul treacle, or Kithul Pani, is a traditional and highly valued natural sweetener from Sri Lanka, made by slowly boiling the sap of the Kithul palm tree. This process creates a rich, dark golden-brown syrup with a unique, earthy, and nutty flavor. It's used as a natural alternative to sugar in beverages and is a key ingredient in many traditional Sri Lankan desserts like Watalappam.