Cookery competition. The next set of hopefuls are put to the test in the studio, before facing their first taste of a professional kitchen in a busy London brasserie.
In the second of the week's heats, the next set of hopefuls pick up their knives and show off their culinary skills.
Firstly, they must overcome the notorious Invention Test and prove that, in only one hour, they can deliver an amazing plate of food with no planning.
No-one goes home after this because next they have to survive the extremely tricky Palate Test, a brand new MasterChef challenge. John demonstrates seafood chowder and soda bread. Without seeing the demo, the amateurs are given just a few minutes to taste this dish before being asked to write down exactly what is in it, using their sense of smell, and palate. Then they are asked to recreate John's dish in just one hour - without a recipe. At the end of these two challenges, some of the hopefuls will have reached the end of their MasterChef journey.
Next, the remaining contestants must face their first taste of a professional kitchen, as they try to stand up to the pressure of a busy lunch service in London's Brasserie Joel. Paying customers' expectations must be met, and with only one hour to get to grips with the dishes the heat is really on.
Then, it's back to the MasterChef kitchen for the final test of tonight's Heat show - cooking their own two brilliant courses to impress John and Gregg. The contestants must draw on all their skills and influences as they prepare this food because it is their last chance to win a place in the quarter-finals.
Only the best will survive, taking their first step towards being crowned MasterChef Champion 2013.