'Petha' is made from

Petha is made from Ash gourd.
Ash gourds, commonly referred to as white pumpkins, are a vegetable with a pale-green exterior and white, heavily-seeded, savory inside that is used to make petha. The gourd is sliced into bite-sized pieces and then cured for a few hours in a solution of lime. They boil the gourd pieces until they are soft after removing them from the lime solution, and then they soak them in a flavorful syrup. The final candy has a sugar-crisp exterior and an almost moist, sticky interior with a chewy, crystalline texture.