The New-York Historical Society’s new Jewish deli exhibit is getting rave reviews as it kicks off a months-long run highlighting the history of these delicious establishments in all their quirk and knish grandeur. Sure, it’s cute that someone was passionate enough about Jewish delis to codify its history with an official exhibit. Advertisement But why? Why spend money to go see an exhibit about delis when you can just use the $22 price of admission to go to a real deli and get, say, a giant pastrami on rye, fat wedge fries, full sour pickle and a Dr. Brown’s soda?...