Despite its name proclaiming a Genoese origin, this delicious Neapolitan pasta sauce, a cousin of the French soubise onion sauce, is unknown in Genoa today. It is thought to have been brought to Naples by sailors from Genoa long ago, and to have survived in the south long after it faded into obscurity in the north.
Now Sugo alla Genovese borders on a religion in Naples, where countless households make it every Sunday with the traditional local dried pasta from Gragnano, bought long and broken into serving-size lengths just before boiling it, a job often performed with help from the children of the household. The sauce cooks all day, and when it's done the onions are sweet and amazing.
This is not a vegetarian recipe. A beef roast cooks with the onions, flavoring them, but it is not served in the sauce or with the pasta at all. In Italy it's traditional to have a simple pasta course before a main course, the primo before the larger secondo. At a fine dinner, you would expect a small dish of pasta with one of the many wonderful sauces (ragu, sugo, salsa) invented for the purpose. A heaping plate of spaghetti is what you eat when you can't afford the secondo course.
The photo to the right is from an artisan pasta shop in Gragnano. Candela is a long tube-like pasta shape about twice as wide as bucatini. As you can see in the photo, Mr. Somma wants tourists to know that this particular shape is to be broken into shorter lengths for cooking. It's in English because the Italians already know this.