Dried parsley has a more concentrated, earthy flavor compared to fresh parsley, which is brighter and more delicate. Use about one-third the amount of dried parsley as you would fresh parsley in sauces.
Fresh parsley offers a vibrant, slightly peppery, and clean taste that enhances the overall freshness of a sauce. It's best added towards the end of cooking to preserve its flavor and color. Dried parsley, on the other hand, undergoes a dehydration process that intensifies its flavor compounds, resulting in a more robust, almost hay-like taste. This process also diminishes some of the brighter, volatile oils found in fresh parsley.
When substituting dried parsley for fresh, it's crucial to adjust the quantity. A general rule of thumb is to use one-third the amount of dried parsley as you would fresh. For example, if a recipe calls for 3 tablespoons of fresh parsley, use 1 tablespoon of dried parsley. Dried parsley also benefits from being added earlier in the cooking process, allowing it to rehydrate and release its flavor more fully into the sauce. This is especially important in simmered sauces where the dried parsley has ample time to infuse its flavor.
If you only have dried parsley on hand and want to mimic the fresh flavor, try adding a squeeze of lemon juice to the sauce along with the dried parsley. The acidity helps to brighten the overall flavor profile and compensate for the lack of fresh, vibrant notes.