1. Always ensure the batter should be dropping consistency, else the vadai will turn hard.
2. If making later , put the grind batter in the refrigerator and add salt, yogurt and coconut bits just before frying.
3. You can add grated coconut too.
4. Adding sour curd will make the vadai soft inside and crispy outside.
5. Thavala vadai pairs well with getti chutney.