Gather all ingredients: fresh basil leaves, garlic clove, pine nuts, extra virgin olive oil, salt, and pepper.

Rinse basil leaves and pat dry.

Peel the garlic clove.

In a food processor, combine basil leaves, garlic clove, and pine nuts.

Process until finely chopped.

Slowly drizzle in extra virgin olive oil while the food processor is running.

Continue processing until a smooth paste forms.

Season with salt and pepper to taste.

Transfer pesto to a clean jar.

Pour a thin layer of olive oil over the surface of the pesto to prevent oxidation.

Refrigerate until ready to use.

Toss with cooked spaghetti or your favorite pasta.