How to Make It
Preheat the oven to 400°. Toast the nuts on a baking sheet for about 4 minutes, or until lightly browned.
Coarsely chop the basil leaves. In a large mortar, combine the basil and garlic and pound to a coarse paste. Add the nuts and pound until a smooth paste forms. Stir in the Parmesan, then 3/4 cup of the olive oil. Transfer the pesto to a bowl and season with salt and pepper. Smooth the surface and pour a little olive oil on top to seal.