Pesto (), also known as pesto genovese, is an Italian cuisine paste traditionally made with Leaf of Genovese basil, extra virgin olive oil, Parmesan (alternatively Grana Padano), pecorino sardo, , and garlic. It originated in the city of Genoa and is used to dress pasta.
The introduction of basil, the main ingredient of modern pesto, occurred in more recent times and is first documented only from the 1850s. Emanuele Rossi published La Vera Cucineria Genovese in 1852 and gastronomist Giovanni Battista Ratto published La Cuciniera Genovese in 1863:
Basil took the firmest root in the regions of Liguria, Italy, and Provence, France. It is abundant in these regions in season, and marjoram and parsley may be used when basil is out of season. Ratto mentions Dutch cheese (formaggio olandese) instead of pecorino sardo (Sardinian sheep's cheese), since Northern European cheeses were common in Genoa at the time, thanks to the centuries-long commercial trades of the maritime republic.
This recipe for pesto alla genovese was often revised in the following years (a noted revision by Emanuele Rossi occurred in 1865, only a couple of years after Ratto's Cuciniera), and it shortly became a staple in the Ligurian culinary tradition, with many variants.
An early American pesto recipe was published in 1928; it includes butter and cream. In 1946, Sunset magazine published a pesto recipe by Angelo Pellegrini. Pesto became popular in North America in the 1980s and 1990s.
The original pesto alla genovese is made with Genovese basil, coarse salt, garlic, Ligurian extra virgin olive oil (Taggiasco), European (sometimes toasted), and a grated cheese such as Parmesan or Grana Padano and pecorino sardo or pecorino romano. A proposal is under preparation by the Palatifini Association to have pesto alla genovese included in the UNESCO intangible cultural heritage list.
There is a slightly different version in Provence, where it is known as pistou (from pistar, 'to pound' in Occitan language). Pistou is generally made with only olive oil, basil, and garlic, and not cheese, although some modern versions include it. Almonds or breadcrumbs can be used to give the final consistency. Pistou is used in the soupe au pistou, a hearty vegetable soup.
Outside of Italy, sometimes almond, Brazil, cashew, hazelnut, macadamia, pecan, pistachio, walnut or even peanuts are used instead of pine nuts, and sometimes coriander, dill, kale, mint, parsley, rocket, spinach or wild garlic leaves are mixed in with the basil leaves. Any combination of flavourful leaves, oily nuts, hard cheese, olive oil, garlic, salt, and lemon juice can produce a pesto-like condiment.
Pesto alla siciliana, also known as pesto alla trapanese and sometimes called pesto rosso ('red pesto'), is a sauce from Sicily similar to pesto alla genovese but with the addition of fresh tomato and almonds instead of pine nuts, and much less basil.
Pesto alla calabrese is a sauce from Calabria consisting of (grilled) bell peppers, black pepper, and more; these ingredients give it a distinctively spicy taste.
Outside Italy, the name "pesto" has been used for all sorts of cold sauces or dips, mostly without any of the original ingredients: coriander, dill, kale, mint, parsley, rocket, spinach or wild garlic (instead of or in addition to basil), artichokes, black olives, green olives, lemon peel, lime peel or mushrooms. In more northern countries, ramson leaves are sometimes used instead of basil.
Vegan variations may substitute miso paste and nutritional yeast for cheese.
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