Soaking rice and dals:
in a bowl take rice, moong dal. tuvar dal and urad dal

Soak for 5 to 6 hour

Crush in mixture and make a thick batter

Take out in a bowl add curd and mix well

Add baking soda and cover the better for ferment 8 to 9 hours or overnight

In a small grinder take ginger, garlic, green chilies.add 1 tbsp water and grind to a smooth paste.

Heat 1 tbsp oil in a small pan.add mustard seeds, then add fenugreek seeds, hing and 1 tsp chopped curry leaves.fry for a few seconds.

Then add the ginger+garlic+green chilli paste.saute it

Add lauki in batter

Also add turmeric powder and coriander powder.mix well,now add coriander leaves and mix well

Add salt,heat a pan and 1 tbsp oil in it,Pour handva better thickness is 1 to 1.5 inch

Sprinkle some sesame seeds on top all over the batter.cover the pan with a lid and then cook handvo on a low flame.

After 10 to 15 minutes check handvo, And turn over, Also cook for 20 to 25 minute or until cooks.Serve hot