Slice the onions lengthwise.

Heat oil in a pan.

Saute red chillies.

Add the onions and saute until it turns brown.

Add tamarind also if it is used instead of vinegar.

Grind the fried onions and red chillies in a mixer.

Add salt to taste.

:- Serve with dosa or idli.... n enjoy...

***Note - *Vinegar can be replaced by tamarind (Valan puli). Use it in the size of a gooseberry (Nellikka) and fry it along with the onions.