Soak 1 cup kabuli chana (chickpeas) for 5 hours.
Pressure cook for 3 to 4 whistles. Keep aside.
Dissolve 1 tbsp gram flour in ¼ cup water and keep aside.
Heat a pan.
Add a cup of water.
When the water begins to boil, add turmeric powder, red chilly powder, cumin-coriander powder, besan mixture and mix well.
Allow this to cook for 3 to 4 minutes.
Now add the boiled chana and salt and mix.
The chana should be coated well with the masala.
Add chopped onion and tomato and mix. Cook for 5 minutes.
To assemble the chaat, take a bowl or a serving plate.
Add the masala chanas.
Add the boiled potato cubes.
Sprinkle chaat masala.
Drizzle green chutney and tamarind chutney over it.
Drizzle the whisked curds.
Add the broken papdi pieces and sev.
Garnish with chopped fresh coriander, chopped onion and chopped tomato.
Serve immediately.