The five celebrities up for the MasterChef challenge this week are model and TV personality Penny Lancaster, singer and `X-Factor' winner Megan McKenna, broadcaster Melanie Sykes, fashion designer and `Great British Sewing Bee' judge Patrick Grant, and `Britain's Got Talent' finalist and award-winning comedian Nabil Abdulrashid. The first challenge for the five hopefuls is Under the Cloche. In front of each celebrity is a cloche, underneath which is an ingredient.