Matt Tebbutt travels Uruguay to solve a mystery surrounding corned beef, and Briony Williams heads to Ireland to discover the difference between Scottish whisky and Irish whiskey. Plus, Dr Helen Lawal finds out the tricks snack manufacturers use to keep customers wanting more.

Special episode featuring baking-related reports. Andi Oliver goes behind the scenes at Maryland Cookies, to find out how chocolate chips keep their shape. Briony May Williams heads to Germany to get to the bottom of a pretzel mystery, and also learns the surprising truth behind where bicarbonate of soda comes from, while Jimmy Doherty learns about the explosive properties of flour.