Set aside 1 chopped onion for garnishing.
Cook mixed vegetables, potatoes and peas in a pressure cooker.
Don't add too much water while cooking.
After the vegetables are done, drain and mash them coarsely.
Heat butter (or oil) in a pan and fry onion and ginger/garlic.
When onions turn translucent, add bell peppers and tomatoes.
Continue frying till it turns soft.
Now add Pav Bhaji Masala, chili powder, turmeric powder, salt and fry
for another couple of minutes.
Now you can add the mashed vegetables.
Turn up the heat and continue stirring till everything is well incorporated.
Take off the stove when the bhaji is thick.
Cut Pavs in half horizontally and lightly coat it with butter.
Roast them on hot griddle just before serving.
Garnish Bhaji with chopped coriander leaves, chopped onions and a thin
wedge of lemon.