Rome is home to four iconic pasta dishes - carbonara, cacio e pepe, amatriciana, and gricia.

What's interesting is that they're all built from the same handful of ingredients, just added or taken away.

Pecorino romano, black pepper, guanciale, egg yolks, and tomatoes - that's it.

Here's an easy visual guide to follow - and to impress everyone with your knowledge next time you're in Rome.