Wash and soak rice, chana dal, moong dal, udad dal in water for 5 to 6 hours.
Drain the water. Blend the rice and lentils alongwith curds to a smooth paste.
Transfer the batter to a vessel and keep it for fermenting for 7 to 8 hours.
To the fermented batter, add ginger-green chillies paste, turmeric powder, red chilly powder, sugar, salt, oil, lemon juice and mix well.
Next, add grated carrots, grated bottle gourd, chopped coriander leaves and mix well.
Now, add eno and give a quick mix.
Heat a non-stick pan. Add 2 to 3 tbsp oil.
Add mustard seeds, carom seeds, asafoetida and sesame seeds.
Saute for few seconds.
Pour half the batter to make a thick layer.Spread it evenly.
Cover with a lid and cook on a slow flame for 8 to 10 minutes or till the base turns crisp.
Lift the handvo gently using a flat ladle and flip it.
Cook on the other side for few minutes.
Cool slightly and cut into desired shapes.
Repeat the same with the remaining batter to make another handvo.
Serve the handvo with green chutney and tomato sauce.