Homemade Pesto : Original recipe from Genova |  Pesto is a sauce cold, synonym and symbol of Genoa and the whole Liguria, which for several decades is one of the most well-known and widespread sauces in the world. The first traces of pesto we find even in 800 and since then, the recipe has always remained the same, at least in home preparation. To do the real pesto sauce takes a marble mortar and a wooden pestle ... and a lot of patience.