Put the sliced onion, kadala, salt, green chilly, curry leaves, pepper powder and water in a cooker and cook until the kadala is done.

Take 2 tbsp of kadala and grind it in a mixer grinder.

Heat oil in a pan.

Splutter mustard seeds and saute dry chillies.

Add masala powders and saute till the raw smell goes.

Add this to the curry along with the kadala paste (gives thickness to gravy) and boil till the gravy is reduced.