Firstly heat oil in a 3-liter pressure cooker when the oil is hot add mustard seeds, and chana dal; let them splutter
Furthermore, add curry leaves and green chilli and roast
Add onion and saute for a minute
Furthermore, add the required salt and saute till onion's raw smell goes off
Add 1/4 teaspoon of turmeric powder and chopped potatoes, mix well
Furthermore, add 1/4 teaspoon turmeric powder and water; mix well and bring to a frothy boil
Mix well and pressure cook for 3 whistles, natural pressure release
Mash a few potatoes and Add a pinch of sugar and coriander leaves, cook for 3 minutes and turn off the stove
Finally before serving add lemon juice and serve with poori