To make onion dosai. Heat the tawa pour the batter make a thin crispy dosa and take finely chopped onions and place it on the middle of the dosa and spread it
Fold it as shown the picture
Vengaya chutney take a pan and pour in some oil add roughly chopped tomatoes and onions and some coriender seeds if you like the flavour of it
After it is golden brown add the red chilli green chilli garlic and tamarind
Transfer to a mixi jar and grind it adjust the salt according to your taste