In a medium sauce pan add lentils and 3 cups of water. Bring to a boil and simmer until the lentils are fully softened. Drain the water and mash well with a potato masher.
Melt one tbsp butter in a pan. Add onion, carrots, mushrooms and saute until veggies are soft and tender. Remove from heat. Set aside to cool.
Combine lentils, vegetable mixture, red chili, turmeric, cumin powder, chat masala, lemon juice, coriander and salt in a large bowl
Stir in egg, bread crumbs and mix thoroughly.
Divide the lentil mixture into equal portions. Shape them in round thick patties. Cover and refrigerate for an hour.
Heat oil in a sauté pan, once the oil is shimmering, cook the veggie burger, until crisp and golden brown on both the sides.