Which herb is a key ingredient in pesto?

Basil is a key ingredient in traditional pesto, which is a sauce originating from Genoa in Italy. The distinctive, aromatic flavor of basil gives pesto its signature taste, making it the primary herb used in the recipe.

In addition to basil, pesto typically includes garlic, pine nuts, Parmesan cheese, and olive oil. While other herbs such as oregano, cilantro, and thyme are popular in various cuisines, they do not form the base of traditional pesto. Oregano, for instance, is commonly used in Mediterranean cooking, while cilantro adds a different flavor profile, more common in Asian or Latin dishes. Thyme, although versatile, also differs significantly in taste and is not part of the classic pesto composition. Hence, basil stands out as the essential herb in creating authentic pesto.