Soak the small red chickpeas for 8 hours.
Pressure cook the chickpeas with a little salt and turmeric for 6 whistles. Retain some of the cooking water.
In a bowl, take the boiled chickpeas along with some of their cooking water.
Add the boiled and diced potato to the chickpeas.
Add the finely chopped onion.
Add the finely chopped tomato.
Add roasted cumin powder.
Add chaat masala.
Add black salt.
Add finely chopped green chilli. You can adjust the quantity or use a milder chilli if preferred, especially if children will be eating it.
Add Kashmiri red chilli powder.
Add chopped coriander leaves.
Add tomato sauce.
Add the tamarind-date chutney (sweet and sour water).
Add lemon juice.
Add regular salt to taste, keeping in mind that salt was added while boiling the chickpeas.
Mix everything well. The chickpea water will help combine all the spices and ingredients.
This can be eaten as is or used as a filling for pani puri shells for an extra treat.
Enjoy your chatpata treat!