The most famous sauce in McDonald's history is returning on March 31st---SZECHAUN SAUCE! Inspired by Disney's 'Mulan' in 1998, this will only be the 3rd time it's resurfaced since then. But there's a catch. To prevent fights/confrontations in restaurant, you can only order it through the McDonald's App! It will come with McNugget orders OR a-la-cart with a limit of five. Happy hunting!