Wash and chop the mushrooms, soak in water until use.
Wash and peel the potatoes, cube into 1 inch pieces
Heat a nonstick pan with oil
Saute onion julienne till slight coloured.
Add grated ginger and saute well.
Add the cubed potatoes, sprinkle some water and cover with lid.
After 5 mins, add salt and turmeric powder. Stir well and cover to cook for few more mins.
Add the spice powders, along with drained mushroom, sprinkle some more water.
Cover with lid and cook for 5 mins.
Add tomatoes and simmer for 10 mins.
Check if aloo is cooked.
Squeeze in lemon juice.
Serve hot with rotis.