Petha is a traditional Indian sweet that embodies the rich confectionery heritage of the subcontinent. This beloved dessert is a family favorite at festivals, weddings, and celebrations.
Cut the ash gourd into medium cubes and soak them in 1 tbsp lime dissolved in 4 cups water for 30 minutes to help firm the texture.
Drain and rinse the cubes well under running water to remove traces of lime, then blanch the cubes in boiling water for 6–8 minutes until they turn translucent but remain firm.
Prepare a sugar syrup by dissolving 4 cups sugar in 4 cups water in a large saucepan; heat over medium until the syrup reaches a single-thread consistency (drop between fingers forms a thin thread).
Add the drained, blanched ash gourd to the simmering syrup. Maintain a gentle simmer (medium-low heat) and cook for 60–75 minutes, stirring occasionally, until cubes become glassy and almost all syrup is absorbed.
Finish by stirring in rose water, turn off the heat, let the petha cool in the remaining syrup, then transfer the pieces onto a wire rack to set and dry for at least 1 hour before serving.