Wash and finely mince the mushroom. You can use a food processor or just mince it with a knife like I did.
Heat a flat pan and add one tablespoon oil. Add 1 green chili, 2 teaspoon chopped ginger, 4 minced garlic and 1 finely chopped white onion. Stir well and cook for 5 minutes till onion turns soft.
Add mushroom and cook uncovered for 5-7 minutes till some of the liquid is absorbed.
Add 1 medium tomato and cook further till all the liquid evaporates, about 10 minutes.
Now add ½ teaspoon turmeric powder and 1 tablespoon tomato paste ( donot skip). Cook for 2 minutes. at this point the mixture should look moist (but not runny).
Add 2 teaspoon Meat Masala ( it doesn’t have any meat ingredient, just spices), 1 teaspoon each of Kashmiri red chili powder, coriander powder and salt. Mix and cook for 3-4 minutes.
Finally add 2 teaspoons butter ( skip if vegan), ¼ teaspoon garam masala, squeeze of lemon juice and fresh coriander leaves. Mix well, taste and adjust salt.
Enjoy the delicious Mushroom Keema with chapathi or rice.