Congratulations to Kathleen Morrison for an excellent recipe of this popular dish, which captures a very authentic taste. I make one small addition and that is to obtain a slightly "burnt taste" which I enjoy at my local Indian Restaurant. The method to achieve this is right at the end of cooking. Add tsp of ground pepper and flame the mix with a gas torch until the mushrooms just blacken slightly. Sprinkle with lime juice before serving. Try it, you will be pleasantly surprised!
Keep smiling and happy cooking (indian of course!)