these are the few left over. our john berman got the tough assignment of heading into the kitchen of one of america s beloved chefs and learning the secret to her homemade sweet christmas. reporter: if christmas has a global food headquarters, headquarters with a sweet kitchen and an italian accent, it might be here. bon giorno. welcome to my home. reporter: the new york home of lidia bastianich. you ve got to be comfortable in the kitchen. reporter: she s a celebrated chef, cookbook author, restaurateur, and the italian grandmother i never knew i had. you ve got the touch. reporter: she had me over to help cook. okay. one of our favorites is crostoli. reporter: and to talk about her new children s book and pbs