The last four chefs taking part in this year's competition hit the stoves. Awaiting them are two challenges that would have any professional chef quivering in the wings. They will need to outperform their rivals if they want a coveted place in the quarter-final.It's a nerve-wracking start as they each take on the skills test. Marcus asks the first two chefs to dish up a beef fillet, with mushrooms on toast and a red wine sauce. Cooking the meat is one thing, but packing flavour into a rich, deep, red wine sauce, in just 20 minutes, will truly test their professional prowess.The next two contenders will be hoping their dessert skills are up to scratch, as they attempt Monica's recipe for a scrumptious tiramisu. To triumph in this task, the judges will be expecting just the right blend of coffee-soaked sponge, cream and sweet mascarpone – all layered to perfection.The four will then get a chance to size up the competition as they deliver their signature menu. One main course and one dessert that fully showcase their talents. Taking a risk might just pay off for the professionals, or it could signal their downfall. There's only one way to find out.It's then time for the verdict. Which chefs have shown themselves in the best light and are deserving of a place in the last quarter-final?