This perfect chocolate and caramel Swiss roll recipe showcases complex chemistry, from protein foams to carbon dioxide fluff ...

Roll the dough out into a large rectangle. Drizzle half of the caramel over the dough then scatter with the chopped apples. Roll the dough into a tight cylinder and cut twelve 4cm/1½in slices ...

The Great British Bake Off‘s Josh Smalley has prepared a science-led chocolate and caramel Swiss roll recipe. Not only is it a perfect crowd-pleaser, it showcases some complex chemistry.

This recipe for apple pie phyllo rolls with caramel sauce from developer Jessica Morone from Jess Loves Baking does just that ...