Take out the skin of the lauki and cut it into small pieces. With help of a knife cut out the white middle part of the lauki.
Take these pieces into a grinder and make a paste. With help of both hands squeeze out as much possible water from the lauki paste.
In the same way, make onion paste in a grinder and squeeze out water.
Then in a bowl mix wheat flour, besan, rava, turmeric powder, hing, cumin seeds, fennel seeds, salt, sugar, and baking soda. g
Then add ginger paste, green chili paste, coriander leaves, lemon juice, oil, lauki, and onion paste. Mix well and knead it into a soft dough. Use water if needed.
Prepare steamer. Add about 3 cups of water and let it come to boil
Then grease the steamer tray with oil.
Apply some oil on your palms, take a small portion of the dough and shape it into a cylindrical roll. Arrange on a greased tray.
Steam it for 20-25 minutes.
Let it cool for 5 minutes, and remove it from the cutting board. then cut into half-inch slices.