medium onion or ⅓ cup finely chopped onion • medium tomatoes or 1 cup finely chopped tomatoes • medium capsicum or ½ cup finely chopped capsicum (bell pepper) • garlic + ½ inch ginger + 1 to 2 green chilies - crushed to a paste in a mortar-pestle • cumin seeds • turmeric powder • red chilli powder • pav bhaji masala, add as per taste • butter • water • salt • pav, sliced in halves •