- Take a pan, add peppercorns, red gram, coriander seeds, dry red chilies, dry coconut pieces, whole garammasala spices, dry roast in slow flow tillthe color of ingredients turns slightlychanged, transfer to a plate, cool them, grind to a coarse powder and keep aside. Heat oil in a pan, add mustard seeds, cumin seeds, dry red chilies, fenugreek seeds, toss it, add finely chopped onions, curry leaves, ginger, garlic, turmeric powder, hing and saute for about 2 to 3 minutes. Transfer the prepared Chettinadmasala powder, tamarind pulp, cook for about 5 minutes, add jaggery, slightlybigger cubes of onions, boiled baby potatoes, mix it and cook till the gravy reaches to the desired consistency. Now add mushrooms, chopped coriander leaves, cook for about 2 to 3 minutes, turn off the flame and transfer to a serving bowl. Hot and delicious potato mushroom curry is ready.