Rao's is the legendary, tiny corner restaurant in East Harlem where it's impossible to book a table: each of the red-checked, cloth-covered four-, six-, and two-tops is reserved for a titan of New York industry, a celebrity, or a major politician. Permanently. Now Frank Pellegrino, the third generation of his family to operate the impossible-to-get-into Rao's restaurant in East Harlem and founder of Rao's food products line, goes deep into the...