MasterChef continues its tenth and most inspirational series yet. Of the hundreds that auditioned, 60 amateur cooks have been whittled down to the most promising ten. All of them have just one goal: to lift the coveted MasterChef Champion trophy. The competition is about to get serious as Knockout Week begins. At the end of this week, only the best six can become semi-finalists. Over the next two episodes it's a baptism of fire as the remaining ten contestants are split into two groups of five and get their first taste of professional cooking. In this episode the first group of five contestants head to a restaurant in London, where MasterChef: The Professionals finalist Adam Handling is head chef. During a busy lunch service, the five amateurs will be responsible for serving up every dish on the menu to paying customers. Who will falter as they cook in a completely unfamiliar and demanding environment? Then, back at MasterChef HQ, the cooks face an invention test to show John and Gregg what they have learned. In a last-chance bid to stay in the competition, each contestant must show they can invent a dish from scratch that looks and tastes exceptional. They can choose from a plentiful array of seasonal produce that ranges from the everyday to top-end ingredients. In an unexpected twist, they present their food not only to John and Gregg, but also to renowned two-Michelin-starred chef Marcus Wareing, who helps John and Gregg evaluate the five amateurs. After this, one of them will be going home. Who will crumble under the pressure and who will make it through to Friday's challenge - the gateway to this year's semi-finals?