Yes, herb stems like cilantro and mint can be used in cooking, often adding a more intense flavor than the leaves. They are particularly useful in stocks, soups, and sauces.
Herb stems are packed with flavor, sometimes even more so than the leaves themselves. Cilantro stems, for example, have a bright, peppery taste, while mint stems offer a concentrated minty essence. Instead of discarding them, consider incorporating them into your cooking in the following ways:
Before using herb stems, wash them thoroughly to remove any dirt or debris. Also, consider the texture of the stems; some stems, especially from older herbs, can be tough and fibrous. In these cases, it's best to use them in applications where they will be strained out later.
When using herb stems, start with a small amount and taste as you go. The flavor can be quite potent, and you want to ensure it complements the other ingredients in your dish without overpowering them.