What is the main ingredient of pesto alla genovese?

The main ingredient of pesto alla genovese is basil. Authentic versions traditionally use Genovese basil, along with extra-virgin olive oil, garlic, pine nuts, Parmesan or Grana Padano, and pecorino cheese.

The sauce comes from Genoa in Liguria, northwestern Italy. Its name is related to the Genoese verb pestâ, meaning “to pound” or “crush,” reflecting the traditional preparation in a marble mortar with a wooden pestle. The basil is crushed with garlic, pine nuts, salt, cheese, and oil into a fragrant green paste.

Modern pesto has deeper roots in older crushed herb-and-garlic sauces, but basil became central to the Genoese version during the 19th century. Recipes published in Genoa in the 1850s and 1860s helped establish the combination now recognized worldwide.

A common mix-up is assuming that any green sauce is pesto alla genovese. Pesto made with kale, spinach, or parsley can be a useful variation, but it is not the classic basil-based preparation. The word pesto itself can describe other pounded sauces, while “pesto genovese” identifies the traditional Ligurian style.