Place the basil, salt, pepper, whole cloves of garlic and pistachios in the medium sized bowl of a food processor or mini prep. Pulse about 5-7 times to chop the basil and garlic. Then, turn the machine on and pour the oil in slowly through the feed tube at the top. Stop when you have a thick sauce, about 30 seconds or so.
2 cups of basil leaves, 1-2 teaspoons kosher salt, 2 cloves garlic, ½ teaspoon ground black pepper, 3 Tablespoons pistachio meats, ⅓ cup olive oil