Take sour curd in a bowl, add water and stir well
Add ginger, chili paste, turmeric powder, asafoetida, salt and mix well
Add besan and mix well without forming lumps
Grease oil on plates
Mix chopped coriander and coconut and keep aside
Pour the batter in a saucepan and start cooking in medium flame
Keep constantly stirring the mix, careful there should not be any lumps formed
Lower the flame once the batter thickens
Try to spread the batter in the plate and roll it, if unable to roll then batter needs little more cooking
Pour the thickened batter on the greased plate and spread well evenly into a thin layer
Allow it to cool a little bit
Cut the layer into equal sized strips
Scatter coriander and coconut mix over the layer
Gently roll each strip tightly
Heat oil in a pan
Temper mustard seeds, allow it to splutter
Add curry leaves, green chili and fry for a min
Add sesame seeds and fry a bit
Garnish over the khandvis
Serve hot with coriander and/or mint chutney