Pesto became a staple in the Ligurian culinary tradition, with each family often featuring its own pesto recipe (with slight differences to the traditional ingredients). This is the main reason why pesto recipes often differ from each other. In 1944, "The New York Times" mentioned an imported canned pesto paste. In 1946, "Sunset" magazine published a pesto recipe by Angelo Pellegrini. Pesto did not become popular in North America until the 1980s and 1990s. Pesto is traditionally prepared in a marble mortar with a wooden pestle. First, garlic and pine nuts are placed in the mortar and reduced to a cream,
Genovese sauce brought by Genovese immigrants or merchants, at a time when Genoa and Naples were two of Italy's most important ports. It could also be referring to its inventor's name, since Genovese is a widespread surname in Campania. Genovese sauce is now unknown beyond Campania. The sauce's use of onions may reflect a French influence, and resembles Boeuf à la mode. During the mid 19th century, ‘Salmon in Hollandaise and Genovese sauce’ was served in the Grand Véfour restaurant of the Palais-Royal in Paris as a luxury dish. Genovese sauce is not to be confused with Pesto from Genoa and Liguria,