Soak 2 cup black chick peas/ black gram / kala chana in enough water for at least 6 hours, it become triple in volume after soaking
If you want to sprout them then soak again for minimum 8 hours and then drain and keep covered for 2 days .
Take soaked gram and pressure cook for 6 whistles on medium heat.
Take 3 tbsp oil in a pan ,add 1/2 tsp cumin seeds, asafoetida, grated or chopped 1 tsp ginger, 2 chopped green chilies and curry leaves .
Stir fry for a while ,now add 2 chopped tomatoes(if you want little gravy then add 3,4 tomatoes ) and salt,and cover with a lid
Cook till tomatoes become soft then add 1/2 t.s turmeric ,1/2 t.s black salt, 2 t.s red chili powder, 1 t.s coriander powder,1 tsp garam masala and 1 tsp chana masala or chaat masala.
Fry for a minute then add boiled black gram , cubed boiled potato ,2 tbsp. of water and cook for 2 minute or till moisture evaporates.
Now add 2 tsp of lemon juice and green coriander, check the seasoning, add more lemon juice if required.
Serve garnished with some ginger juliennes, Chopped green coriander, few small tomato pieces, slit green chilies and a lemon slice.
Enjoy as a chaat/salad or as a side dish with your meal.