Onion chutney:

Onions - 2 medium
Tomato - 1
Red chillies - 4 to 5
Tamarind paste - 1 teaspoon
Salt

Chop onions, tomatoes into big chunks. Heat a kadai, add 1 tbspn oil and add red chillies and fry for 2 minutes. Add onions and fry for 6 to 7 minutes. Add tomatoes and fry for another 5 to 6 minutes. Remove
from heat and let it cool. Put this mixture in a mixie or blender, add salt, tamarind paste and grind it coarsely. If you prefer finer chutney, grind it further. Do tadka with oil, mustard seeds, cumin seeds, urad dal, curry leaves and serve with Idli or Dosa.