Meanwhile, in a small skillet, heat 1 tablespoon of the olive oil. Add the pine nuts and cook over low heat, stirring constantly, until they are lightly browned, about 2 minutes. Add the butter and garlic and cook, stirring, until the pine nuts are browned and the garlic is golden, about 2 minutes. Let cool, then transfer to a mini processor. Add the grated cheese and the remaining 3 tablespoons of olive oil and pulse to a chunky puree. Season the pine nut pesto with salt.