It's back to basics on amping up flavor with the magic factor. It's a day of kitchen chemistry for Ina as she tests recipes with and without the magic ingredient that really unlocks the flavor of a dish. First lemon zest in Easy Cheese Danish, then salt and vinegar add their magic to Chicken Salad Sandwiches and finally Chocolate Ganache Cupcakes with and without coffee. Each recipe with and without its magic ingredient gets put to the taste test by Ina's work colleagues to earn its magic factor title.