The largest U.S. seller of San Marzano tomatoes, known to Italian food lovers as the best tomatoes for making pasta sauce, has been hit with two federal lawsuits claiming what’s inside the can isn’t the real thing. San Marzano insists its tomatoes are the real thing. CentoOne suit filed in New York in February alleges fraud and disputes Cento’s yield of San Marzano tomatoes, saying the …