In tonight's second heat, four more professional chefs from around the country attempt to make their mark in the MasterChef kitchen and stake their claim to the coveted title. With their reputations on the line, they face two tense challenges, after which two will progress to this week's quarter-final and two will be sent home.First they face the infamous Skills Test. Two of them take on Marcus's challenge to prepare pan-fried scallops, cauliflower velouté, croutons and a curry butter. The others face Monica's dessert challenge, a chocolate crème pâtissière-filled swiss roll served with a raspberry sauce. Each has just 20 minutes to get all the details right.Then the chefs get the chance to showcase their individual cooking style as they prepare two standout Signature Dishes – one main and one dessert. This is a chance for the chefs to make up for any mistakes made in the Skills Test and to show the judges what they are made of. Only the two best chefs will retain their places in the competition.