Chick-Fil-A's iconic breaded chicken breast sandwich took four years to perfect, with the top-secret seasoning, blend of nearly two dozen ingredients, and detailed touches such as the two pickle slice garnish, peanut oil, and bread toasting bread. Founder Truett Cathy worked on many iterations of the dish, often sourcing customer feedback at his diner to make improvements. Once finalized, the sandwich debuted at his restaurant and later, the first Chick-Fl-A. To this day, the recipe remains concealed in an Atlanta, Georgia safe.