Take a pan add half cup oil heat well then add 2 onion slices and saute untill it turns golden brown. Then transfer it in a paper napkin and keep aside. In the same pan add 1/2 tsp cumin seeds, 2 cloves, pepper corns, 1 bay leaves and black cardamom, saute few seconds then add one chopped onion, saute when it turns light brown then add ginger garlic paste and saute one minutes. Then add tomatoes, chilli powder, salt and mix well cover and cooked on medium flame untill tomatoes become mushy.