To begin making the Spicy Paneer Bhurji Pav Sandwich, we'll begin by making paneer bhurji.

Place a pan on the heat and warm the oil in it. To it, add ginger and green chilies and saute for a minute or two. Then add the chopped onions and continue to saute until translucent.

Followed by chopped tomatoes, turmeric powder and red chilli powder - add them all into the pan and continue to cook, stirring continuously until the tomatoes are softened.

Continue to cook till some moisture dries out and the masalas begin to leave the sides of the pan.

At this stage, add the crumbled paneer, season with required salt and mix well.

Cook the prepared bhurji on a medium heat for another minute or two. Sprinkle chopped coriander, turn off the heat and set the bhurji aside till later use.

Apply butter on the pav buns, place them on a preheated pan and toast them on medium heat until browned and crisp.

The next step is to assemble the Pav Sandwiches. To do this, Slice each pav into half and lay them flat on a work surface. Scoop a spoonful of paneer bhurji and serve hot. 

Serve the Spicy Paneer Bhurji Pav Sandwich Recipe along with Calcutta Style Puchkas and a hot cup of Masala Chai for a chaat party.