In a wok or a deep pan, heat olive oil and saute green chili and onion until the onion is soft and translucent. Add in the sliced mushrooms and salt, and cook until the mushrooms start to brown.
Add the minced garlic, and cook for a minute until it's fragrant. Then add the spices, tomato paste and water. Simmer until the sauce thickens and serve.
Notes
Store the leftovers in an airtight container in the fridge for up to 3 days.