The semi-final stage continues with the second group of four chefs facing off over two challenges in the hope of making it to finals week.As in the previous episode, the chefs head to the heart of industrial east London to open a pop-up at a warehouse microbrewery. Working on makeshift workstations with limited equipment and no ovens, they must rise to the challenge and adapt their fine dining style to impress 14 esteemed guests from the world of pop-up kitchens. They have three hours to prepare and deliver one skillful pop-up dish that showcases star quality and is memorable on the menu for all the right reasons.In the second challenge, the four chefs return to the MasterChef kitchen to face a cook-off. They have one hour and 45 minutes to create one dish of exceptional standard. Once the challenge is over, Marcus, Monica and Gregg taste their efforts and decide which chef to send home and which three will complete the finals week line-up.