Source : In A Pan Heat Oil And Roast Black Gram Dal And Dried Red Chilli Add In 1 Finely Chopped Onion And Garlic Saut Till They Turn Slightly Golden In Colou...
Now add tomato and mix well after add salt and cover and cook for 3-4 min cool completely and transfer to the blender. add in small piece tamarind for a taste and blend to smooth consistency.
Now prepare the tempering by heating 2 tsp oil.
Also add in mustard seeds, asafoetida and few curry leaves and allow the tempering to splutter.
Onion tomato chutney ready and serve along with idli or dosa.