The secrets of chef Mario Carbone’s Sunday sauce

For generations of Italian-American families, a pot of tomato sauce simmering for hours has been a tradition for bringing the family together. And for chef Mario Carbone, whose namesake New York City restaurant is what he calls a “red sauce joint,” a Sunday sauce filled with ground beef, ground veal and pork sausage is a twist on his family’s recipe. Correspondent Kelefa Sanneh gets a taste.