Pesto

What Is Pesto

Pesto is a sauce made by crushing or grinding ingredients together. The name comes from the Italian verb pestare, meaning "to crush" or "to pound." Traditionally it's made with a mortar and pestle, though food processors and blenders are common today. The result is a vibrant green sauce with a rich, aromatic flavor.

Composition

Classic pesto alla genovese combines five main ingredients:

• Basil The principal ingredient, typically fresh Genoese basil leaves
• Pine nuts Add creaminess and a subtle nutty flavor (walnuts are a common substitute)
• Parmesan cheese Grated Parmigiano Reggiano for salt and umami
• Garlic Fresh garlic, never jarred
• Olive oil Extra-virgin olive oil to bind everything and create the sauce consistency

Authentic pesto alla genovese can also include Pecorino cheese and coarse salt. Some regional versions swap ingredients entirely: Sicilian pesto trapanese uses tomatoes and almonds, while pesto modenese from Modena features lard, garlic, and rosemary.

Origin and History

Pesto originates from Genoa in northwestern Italy, in the Liguria region. Its roots trace back to ancient Roman sauces. Virgil's poem describes moretum, a condiment of garlic, oil, herbs, and cheese crushed in a mortar and pestle. Basil didn't arrive in Italy until the Middle Ages, so early versions lacked that signature ingredient.

In medieval Liguria, agliata—a sauce of garlic, oil, vinegar, and salt—evolved over centuries into modern pesto. Local legend says a monk at a convent dedicated to Saint Basil in Prà (now part of Genoa) first created pesto by pounding basil with ingredients offered by the faithful.

• 1863 First published recipe in Giovanni Battista Ratto's La Cuciniera Genovese, combining garlic, basil, Dutch and Parmesan cheeses, and pine nuts
• 1865 Emanuele Rossi documented it as pesto d'aglio e basilico (garlic and basil pesto)
• 20th century Liguria's Consorzio del Pesto Genovese codified the authentic recipe with specific regional ingredients
• 1990s Pesto surged in popularity in the United States, becoming a staple on pasta, pizza, and sandwiches

Fun Facts

• Mortar and pestle Traditionalists insist the marble mortar and wooden pestle produce a superior texture and flavor compared to blenders
• Basil from Prà Authentic pesto alla genovese specifies young basil from Prà, a village near Genoa known for growing the finest basil
• Protected recipe The authentic version uses Ligurian Taggiasca olives for the oil, Italian pine nuts, and specific cheese blends
• No cooking Pesto is a raw sauce—heat can dull the bright green color and alter the fresh flavor