Pressure cook the vegetables (green peas, potatoes, carrot, brinjal and cauliflower), with some water for 2 whistles. Mash the boiled vegetables and keep aside. Peel the banana and mash with veggies.
Melt the butter in a pan and add capsicum and tomatoes. Stir fry for few seconds and then add boiled vegetables, salt, spices and pav bhaji masala. Mash again with the help of masher, on a medium flame for 5 to 7 minutes, till the veggies are well blended while stirring continuously.
Garnish with chopped coriander leaves and serve with buttery pav and lemon wedges.