Ina Garten's Pine Nut and Walnut Pesto Sauce

Bahan-bahan (16 porsi)

• ¼ cup walnuts
• ¼ cup pine nuts
• 3 tablespoons (about 9 cloves) diced garlic
• 5 cups fresh basil leaves, (packed)
• 1 teaspoon kosher salt
• 1 teaspoon freshly ground black pepper
• 1½ cups extra virgin olive oil
• 1 cup freshly grated Parmesan cheese