Pesto is a green- or red-colored sauce, that originated in Northern Italy. It is made with dry basil leaves, pine nuts, coarse salt, and grated cheese (or olive oil). Parsley, on the other hand, is a herb that is now popular as a spice. It is a common ingredient in Middle Eastern, European, American, and Italian cuisine. Parsley pesto sauce is used to enhance the taste of various Italian dishes like pasta, tacos, lasagna, and so on.