i guess you meant Kartaar Pura..
and yea Banni is an old den of food lovers....its Karrhai's are damn good (Iqbal/Balla)
long time back I tried it in Stadium Food Street and would rate it as 7/10...
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Nashta/Halwa puri point you mentioned is "Refreshment Center" in commercial Market.
I lived some 4 years in Commercial Market area hostels....and ate it a million times...i first tried it was in 2003 when they offered naashta package (2 poori & channa/achaar plate) for Rs. 7 only....but that was 2003...rates have multiplied ever since, but its taste is yummy...and house full as ever....i will rate it as 8/10