Soak channa overnight and cook in a pressure cooker with a pinch of baking soda.
Roast cumin seeds and peppercorns and coriander powder in a pan and powder it.
Heat oil in a heavy bottomed pan.
Saute onions till golden brown.
Add chilly powder, turmeric powder, cumin seeds-pepper-coriander powder and fry for a minute.
Add tomatoes and saute till oil separates.
Add the cooked chana and salt.
Cover and cook for 5 - 10 mins on low flame.
Add water as required.
Add sugar.
Add the amchur powder.
:- If amchur is not available, squeeze lime (1/4 tsp) and add it after removing from flame and in luke warm condition.
Garnish with coriander leaves.