Tomato Chutney (liquid version)

In a pan add a little oil and splutter mustard and urud dhal, with curry leaves. Then add finely chopped onions , saute them well and then add finely chopped tomatoes, saute them well. Add a little turmeric, salt and sambar powder or chili powder. Once its cooked well, then add water and boil. This will be very liquidy. 

Modification, you can add very less water and make it semi solid and also use it. 

For both versions add asafetida at the end. Enjoy with idly or dosai.