Place potatoes, carrots and green beans in the cold water. Allow to soak while you prepare the rest of the vegetables; drain.
In a microwave safe dish place the potatoes, carrots, green beans, peas, salt and turmeric. Cook for 8 minutes.
Heat oil in a large skillet over medium heat. Cook mustard seeds and cumin; when seeds start to sputter and pop, add the onion and saute until transparent. Stir in the tomatoes, garam masala, ginger, garlic and chili powder; saute 3 minutes. Add the cooked vegetables to the tomato mixture and saute 1 minute. Garnish with cilantro leaves.
