Heat 3 tablespoons butter in a non-stick pan. Add onion, mix and sauté for a minute. Add ginger paste and garlic paste, mix and sauté well. Add tomatoes, mix and add salt, red chilli paste, mix and cook on low heat for 5-7 minutes. Add cauliflower, capsicum and green peas and mix well. Add pav bhaji masala and mix well. Reduce heat, add some water, cover and cook till vegetables are done. Mashed potatoes and add along with chopped coriander. Mash well with a masher.

Add some water, mix, cover and cook for 5-7 minutes. Slit pavs and apply butter on them. Heat 1 tablespoon butter on a non-stick tawa, sprinkle some chopped coriander and pav bhaji masala on it, place the pavs and roast them. Transfer the bhaji in a serving bowl and garnish with coriander leaves. Place the bowl on a serving platter and serve immediately with roasted pavs, chopped onion and tomatoes.