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