For a richer flavor, try toasting the pine nuts in a bit of olive oil. Fresh basil is key to a vibrant pesto. Avoid using basil that is wilted or bruised. If you can't find trofie pasta, you can substitute another short, twisted pasta shape, such as fusilli or gemelli. Feel free to add other vegetables to this dish, such as peas or asparagus. For a vegan version, use nutritional yeast instead of Parmesan cheese in the pesto.