Claudia Romeo: Today we're in Genoa, on the Italian Riviera ... Let's go and see how it's made. The old town is scattered with bakeries churning fresh focaccia at every hour of the day.

The original recipe calls for seven ingredients, no more, no less. Basil, extra-virgin olive oil, pine nuts, Parmesan cheese, pecorino cheese, salt, and garlic. We are in Genoa, Italy. Here is ...

Even while Polo was away on his travels in the 1270s, there is a reference to a soldier in the northern Italian city of Genoa ... not until 1844 that the first recipe appears for the most common ...