بابايا (mentioned in your context) is papaya, and "papayasan" comes from papaya. Reference:

Medicinal uses: The leaves and seeds of papaya are a very effective vermifuge, destroying worms and intestinal parasites that settle in the large or small intestines. Papaya leaf, extremely high in beta carotene, is also claimed to prevent infection. ***Papayasan***, made from the leaves and juice of unripe fruits, is said to be a great boost to the pancreas and is prescribed for diabetics.
http://www.asiafood.org/glossary_1.cfm?alpha=P&wordid=2831&s...