2 cups Genovese basil leaves, packed 4 cloves garlic, divided 3 tablespoons pine nuts 1/4 cup grated Parmesan cheese 1/3 cup cool water 1/3 cup mild olive oil 1 teaspoon kosher salt and freshly ground pepper, to taste
Submerge the basil leaves in boiling water for 30 seconds. Remove to an ice bath. Drain and squeeze water from the leaves. Place basil in the work bowl of a food processor or blender.
Peel the garlic cloves. Halve three cloves lengthwise and submerge them in boiling water for 2 minutes. Drain and run cool water over them.
Add all four garlic cloves, quartered, the pine nuts and cheese to the work bowl. Finely chop the mixture with a pulsing action. Scrape down the sides of the bowl.
Pour in the water and oil with the machine running. Scrape down the sides of the bowl, season to taste, pulse briefly. Taste again, and adjust seasonings as needed.
Store the sauce in a tightly covered glass jar. Refrigerate between uses. Sauce can be frozen in containers or frozen in an ice cube trays.