In the last of the quarter-finals, the best chefs from the week's heats come together in the kitchen to cook against each other and continue in their quest for the title. The first test the professionals face is to reinvent a sweet family favourite, fruit crumble. The chefs need to deliver a dish that sets them apart because only four chefs will have the chance to cook for the critics. The remaining four chefs have just one hour and 15 minutes to serve up an exceptional two-course menu to three of the country's most notable restaurant critics. Newcomer Grace Dent joins Jay Rayner and Tracey MacLeod at this week's table. This culinary ensemble is accustomed to dining at some of the UK's most exciting destinations and will only be won over by the very best. After a tough session in the kitchen, one more chef's ambitions will be thwarted when they are sent home. The three remaining chefs move into knockout week.