take a pressure cooker and heat coconut oil in it.
crackle mustard seeds. add chopped ginger, chopped green chilli, curry leaves and chopped onions.
fry until onions are brown.
add chopped tomatoes to this and fry in medium heat until mushy.
now add the soaked chickpeas along with potato, prepared masala, salt, turmeric powder and 2-2.5 cups water.
pressure cook for 5-6 whistles or until it softens.
tempering: heat oil in another pan and add sliced onions, curry leaves and red chilli. fry until reddish.
add the tempering to the curry along with chopped coriander leaves and mix well. mash it slightly.
serve hot with puttu/rice/dosa/idli/appam.