Pesto Pasta

Bahan-bahan (4 porsi)

• 1/3 cup walnuts, toasted (see note)
• 2 large cloves garlic, roughly chopped
• 2 cups packed fresh basil leaves
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 2/3 cup extra virgin olive oil
• 1/2 cup grated Parmigiano-Reggiano
• 1 pound (16 oz) pasta, any shape (I like spaghetti best)
• Salt and freshly ground black pepper
• Parmigiano-Reggiano, optional for serving
• Fresh basil leaves, optional for serving