Cook peas in immersing level water till peas are half done.
Now add thick tamarind extract, jaggery, turmeric powder and chopped potato cubes. Let it cook in low flame till peas and potato cubes are soft.
Meanwhile dry roast split black gram lentil(urad dal) till lentils turn slightly brown.
Combine grated coconut, coriander seeds, cumin seeds, red chillies and roasted black gram lentils in to mixer jar and grind them together in to fine paste. Add this ground paste to cooked potato peas of step 2.
Now cook potato peas curry with ground masala in medium flame. Add salt to taste and little water. Bring it to boil and switch off.
Heat seasoning pan adding oil, mustard seeds and curry leaves, when mustard seeds pop up transfer it to potato peas curry.
Relish this potato peas curry with chapati or rice. It tastes extremely good with each of them.