Petha

Petha is a translucent soft candy from the Indian subcontinent made from ash gourd or white pumpkin. It is simply called petha in Hindi and Urdu. Ash gourds, commonly referred to as white pumpkins, are a vegetable with a pale-green exterior and white, heavily seeded, savoury 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 Calcium Hydroxide, locally known as Choona or Soon. After removing the gourd pieces from the Choona solution, they're boiled until soft, and then soaked in sugar syrup. The final candy has a sugar-crisp exterior and an almost moist, sticky interior with a firm, crunchy, and almost crystalline texture.

Source: Wikipedia