Finely grind the tomato, coconut, masala mix and fried channa (soak the pottu kadala for 10 minues before grinding).
In a thick bottomed pan, fry the onions and green chillies.
Add ginger-garlic paste, chilli powder and turmeric powder and saute it.
Add the washed vegetables and slightly fry them too.
When they are half done, add the ground paste and 2 1/2 cups of water, salt to taste and close and cook on low flame.
When everything is cooked well, mash a few of the potato pieces into the gravy to thicken it, check salt and add more and mix if needed.
Transfer it to a serving bowl and sprinkle coriander leaves on it.
:- Serve hot with chapathi or porotta.