It's the fourth quarter-final, and this week's most talented four cooks return to fight for a place in Knockout Week.They face just one intense challenge. They must cook two courses that will excite not just John and Gregg, but also some of MasterChef's most inspiring winners, finalists and contestants, who have all gone on to careers in the food industry.Their fate is in the hands of two MasterChef champions - from 2020, Thomas Frake, and from 2010, Dhruv Baker – and the finalist from 2021, Alexina Anatole.With just two Knockout Week places up for grabs, these amateurs need to show real flair and ambition to edge closer to the MasterChef 2023 trophy.