Stefan Gates reveals the secrets of supermarket food by making his own from scratch. Does instant soup contain real tomatoes? How much seawater is needed to make sea salt? Stefan challenges Anton Du Beke and Jodie Prenger to make rival bottles of orange squash, but whose will go in the basket and whose will go in the bin?

Stefan Gates reveals the secrets of supermarket food - by making his own from scratch. Why do cheesy puffs melt in the mouth, and why does bubbly chocolate melt faster? Stefan challenges Esther Rantzen and Rebecca Wilcox to make rival chocolate-covered honeycomb bars, but whose will go in the basket and whose will go in the bin?

Stefan Gates reveals the secrets of supermarket food by making his own from scratch. Why does dried spaghetti keep so long, and why do supermarket sandwiches stay soft in the fridge? Stefan challenges MasterChef's John Torode and Lisa Faulkner to make rival 'wheaty breakfast bricks' but whose will go in the basket and whose will go in the bin?

Stefan Gates reveals the secrets of supermarket food by making his own from scratch. Why are coffee granules frozen at the factory? Why must peas be frozen fast? Stefan challenges BBC Breakfast's Carol Kirkwood and Chris Hollins to make rival multi-coloured ice lollies, but whose will go in the basket, and whose will go in the bin?

Why do some pizzas contain 'fake cheese', and how horrible is dog food? Stefan challenges The One Show regulars Lucy Siegle and Mike Dilger to make rival versions of ready-made custard, but whose will go in the basket and whose will go in the bin?

Do energy drinks really work? Why is some honey runny? Stefan challenges Food Show hosts Simon Rimmer and Tim Lovejoy to make rival bags of sugar from sugar cane and sugar beet, but whose will go in the basket and whose will go in the bin?