Put a pan on medium heat and add the chopped potatoes, tomatoes, peas, some salt and enough water to boil the vegetables. Cover the pan and let the vegetables cook, until they turn soft enough to be smashed. Once the vegetables are done, bring out your potato smasher and smash all the vegetables well in the pan itself. You can also add little water from time to time, to make the bhaji soft, mushy and thick. Transfer the bhaji into a different container and put the pan back on medium heat. Add a little vegetable oil or butter as per your choice followed by cumin seeds, finely chopped onions, garlic paste and red chili powder and mix all the ingredients well, then add the chopped capsicum, green chilies, turmeric powder, Kashmiri red chili powder and garam masala, sauté all the ingredients together and let it cook for a minute. Now add the smashed vegetables and mix it well, sprinkle some kasauri meethi on top, and lemon juice, give it a quick stir, take it off the oven and directly to the serving plate.
Put a fresh frying pan on the oven, add some butter and put it on medium heat. Take the pav, add some butter on the base, sprinkle some oregano for taste and put it on the pan.
Serve the dish with a butter cube on top of the bhaji, sprinkle some chopped coriander on top and serve it with lime cube, onion rings and some homemade red chili pickle.
P.S. we have prepared the dish with vegetable oil to keep it healthy, but to give it a street like feel, you can use butter and food color for the authentic taste and color.