Melt butter in a pan, add flour and cook for a minute. Pour milk and stir until the flour blends with milk. Drop the paneer cubes, salt and continue cooking until the sauce thickens. Finally add the kashundi sauce and give it a stir to combine everything.
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to make naan calzone
Dust a little bit of flour on the rolling pin and roll a ball of naan dough to roughly round flat bread. On one side of the flat bread, spoon the kashundi paneer filling along with few red onions and sliced zucchini. Keep a gap of about 1 cm all around the circumference.
Pull the other half of the bread to cover the filling and pinch the edges to seal it. You can also use a fork to press the edges firmly.
Heat a flat pan and brush little butter on it.
Sprinkle little bit of freshly chopped cilantro and sesame seed on top of the calzone and place it on a hot pan. Cover the calzone with a lid and let it cook for a minutes on medium high heat. Turn it and continue cooking for another minute on medium heat.
Continue making rest of the calzones and serve warm.
Notes
If you make the naan using any other flour, the texture would turn out different and might not be fluffy enough.