After four weeks of intense competition it's the first of the semi-finals, and the best cooks remain. The show kicks off with the celebrities' toughest challenge so far - cooking a feast for 70 guests in specially constructed marquee kitchens in a freezing field - so conditions are tough! Split into two teams, it's a race against the clock as the celebrities must design and create four mouthwatering dishes each (meat, fish, vegetarian and dessert) from a selection of ingredients including saddle of lamb, hake, whole salmon and quail, as well as a selection of fruit, vegetables, herbs and spices. Next it's back to the MasterChef kitchen, where they face an Invention Test with a difference. Each contestant is given their favourite ingredient to work with and, along with a well-stocked larder, has 90 minutes to create a dish that celebrates their chosen ingredient to keep them in the competition. Favourite ingredient choices range from mackerel to scallops, chicken breasts to chicken thighs and haggis. At the end of this challenge more celebrities will be going home, and their dream of being Celebrity MasterChef champion 2016 will be over.