Overview: Hosts Julia Collin Davison and Bridget Lancaster reveal the secrets to a foolproof Spinach and Ricotta Gnudi with Tomato-Butter Sauce. Equipment expert Adam Ried shares with Julia his top picks for utensil crocks, and science expert Dan Souza explains the science behind tempered chocolate. Bridget makes Julia classic Baci di Dama (Italian Hazelnut Cookies).