First dry fry the spices: red chilly, channa dal and black pepper corns. Cool and grind to a smooth powder.
Now heat oil in a hard bottomed pan and splutter mustard seeds. Add curry leaves, chopped mushroom and required salt. Saute well.
Add the powdered spices when water starts oozing from the mushrooms. Cook in low flame for a few minutes. Add coriander powder, potato and deep fry it.
Add tamarind paste and cook for few more minutes.
Mushroom/khombi/kaazhan/anabe with tamarind, a tasty as well as nutritious dish, is ready. Garnish with chopped coriander leaves and serve hot.