It's heat two, and the second group of four chefs arrive to kick-start their MasterChef adventure. It will take every ounce of chef know-how to deliver across two tough challenges. Nerves will need to be checked at the door if they hope to impress.Monica's skills test is first, and two chefs are asked to prepare popcorn clams, a mussel fritter, and a Bloody Mary mayonnaise. With two types of batter, deep-frying and pan-frying, the chefs will need a steady hand to nail this brief.Marcus is up next, and the last two chefs are tasked with making a cheeseburger. Not to be fooled into thinking this is easy, the contestants are faced with a vast selection of ingredients, including a variety of meats and seasonings. They can be as creative as they like, as long as the result is a perfectly formed burger that sets the judges' taste buds alight.If any fail to deliver, they still have a chance to redeem themselves with their signature menu: two sterling courses that demonstrate a copious amount of skill, matched with a great palate. The best on the day will earn a place in this week's quarter-final as the hunt for this year's MasterChef: The Professionals champion continues.