As the third week of heats begins, six more amateur cooks try to prove to judges John Torode and Gregg Wallace that they have the potential to be the tenth MasterChef champion. Firstly, the contestants are asked to cook their calling card, a practiced dish that represents who they are as a cook and showcases their talent. They have just one hour to dazzle the judges with one plate of food that shows just what they can do. They then face the infamous invention test, choosing between two sealed boxes of ingredients - one sweet and one savoury. Chef John Torode takes on this challenge himself, showing the viewers at home just what is possible with the few ingredients.