Add dried herbs at the beginning of the cooking process to allow their flavors to fully develop, and incorporate fresh herbs towards the end to preserve their bright, volatile aromas.
The key to successfully layering fresh and dried herbs lies in understanding how heat affects their flavor profiles. Dried herbs have a more concentrated flavor due to the removal of moisture, but they also require time and heat to rehydrate and release their essence. Therefore, they should be added early in the cooking process, such as when sautéing aromatics or simmering sauces. This allows the heat to coax out their flavors and infuse them throughout the dish.
Fresh herbs, on the other hand, are more delicate and contain volatile oils that are easily destroyed by prolonged heat. Adding them too early can result in a loss of their vibrant flavor and aroma. Instead, fresh herbs should be added towards the end of cooking, typically in the last few minutes, or even as a garnish just before serving. This preserves their bright, fresh taste and adds a final layer of complexity to the dish.
Consider the specific herbs you're using. Heartier fresh herbs like rosemary or thyme can withstand slightly longer cooking times than more delicate herbs like basil or parsley. Adjust the timing accordingly to maximize their flavor impact.
When substituting dried herbs for fresh, a general rule of thumb is to use one-third the amount of dried herbs as you would fresh. For example, if a recipe calls for 1 tablespoon of fresh oregano, use 1 teaspoon of dried oregano. This is because dried herbs have a more concentrated flavor.