The Philly cheesesteak is his family legacy. He dared to change the recipe.

PHILADELPHIA — It was not enough to have invented the Philly cheesesteak. Frankie Olivieri was sure of that, even if his father disagreed. The sandwich that had tempted four presidents, Oprah Winfrey, Sylvester Stallone as Rocky Balboa, the pope’s valet — need he go on? — was, per one food influenc...

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