Masala means a spicy mixture. Vegetable masala is a mixture of vegetables like potatoes, carrots, peas and beans cooked with onions & tomatoes adding spices like garam masala powder, ginger and garlic powder.
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 mixture and saute 1 minute. Garnish with cilantro leaves.