firstly, take 2 medium sized potatoes and pressure cook them for 2 whistles.
secondly, 2 tbsp of roasted chana dal or roasted bengal gram or putani in a blender.
ground them to fine powder.
furthermore, in a heavy bottom pan, take 2 tbsp of oil and all the seasoning ingredients. add ½ tsp of jeera, ½ tsp of urad dal and ½ tsp mustard seeds.
once the mustard seeds start spluttering, add finely chopped onions and slit green chilies.
once the onions turns translucent add ginger garlic paste.
now add finely chopped tomatoes and fry them till they turn mushy.
it is now time to spice powders. add 1 tsp of coriander powder and ½ tsp of turmeric.
now add 1½ cup of water and bring them to boil.
add salt as per the taste.
after salt, now add grounded roasted chana dal powder from step 3.
finally, add the boiled potatoes.
lastly, switch of the flame and add chopped coriander leaves.