The slender stems give way to dark, flat leaves that taste robust and fresh. This herb, also known as flat-leaf parsley, is sold on the stems but the leaves are most commonly used in cooking, which can be added whole or chopped. Parsley has a clean and peppery taste with a touch of earthiness, making it a great all-rounder in the kitchen. Running through each leaf is a natural aromatic oil, and it's this which is responsible for its unmistakable flavor. It is the most widely grown herb for both garnish and flavoring.