Heat a tawa or a griddle with 1 tbsp butter on a high flame.
Saute onions & green chilli in the butter until lightly golden.
Add ginger garlic paste and saute tiill the raw smell goes away.
Stir in the tomatoes and sprinkle salt. Cook until they turn soft.
Add capsicums, chili powder and pav bhaji masala. Saute very well for 2 to 3 mins.
Add very little water and allow to cook the masala until soft. Mash up very well with the spatula.
When the masala begins to smell good, add some coriander leaves and mix.
Move all the masala to one side of the tawa.
Add little butter and slit the pav. Toast them on both the sides.
Transfer the masala over the pav. Squeeze in some lemon juice and coriander leaves.
Smear some masala on the top as well. Add some onions and coriander leaves on top.
Serve masala pav immediately.