This week's seven best home cooks return to test their culinary wits and try to prove to judges John Torode and Gregg Wallace that they have the potential to be MasterChef champion 2022.Tonight's challenges are designed to gauge their creativity and culinary repertoire. The first is the Market Challenge, where they must invent a dish on the spot for judges John and Gregg from a market full of ingredients including Bavette steak, plaice and oysters. The pressure is on to impress because at the end of this test one contestant will be sent home.The remaining six then take on their most demanding assignment so far - cooking a dish to a brief set by one of the country's toughest food critics, William Sitwell. William has asked them to cook a dish inspired by a favourite ready-bought food item - sweet or savoury. The four who produce the best dishes will go through to this week's quarter-final. Who can handle the pressure and show they have what it takes to progress further in the competition?