This is my amma's special onion chutney, though it is very simple to prepare it tastes great with hot dosas and idlys.
Onions medium chopped-2
Whole dry red chillies-6
Salt to taste
Whole dry red chilly-1
Heat about 1 tsp of oil, add the chopped onions and dry chilles fry until cooked for about 5 mins. Allow to cool and grind them along with tamarind and salt. Heat oil in a tadka pan and add the tempering ingredients. When the mustard crackles add it to the ground chutney and serve with hot Dosa or Idly.