Take 4 cups of handva flour and 1 cup curd in a mixing bowl. Add water gradually and make thick and pouring consistency of the batter. Spread 1 tsp curd on the prepared batter and allow it to ferment for 5-6 hrs or overnight at a warm place.
Handva batter is properly fermented. Then add grated lauki, coriander leaves, green chilli paste, ginger paste, garlic paste, crushed peanuts, turmeric powder, salt, red chilli powder, black pepper powder and sugar. Mix well.
Now in a tadka pan, add 3 tbsp oil, mustard seeds, cumin seeds, sesame seeds, curry leaves, hing and dry red chilli. mix well.
Then in a batter add baking soda and add hot tempering on it. mix well.
Handva batter is ready.