Dry herbs release their flavors more slowly in soups due to the moisture and longer cooking times, allowing flavors to meld, while in sautéed dishes, their flavors are released quickly and intensely due to the direct heat.
When dry herbs are added to soups, the liquid acts as a solvent, gradually extracting the essential oils and aromatic compounds. The extended simmering time allows these flavors to diffuse throughout the entire dish, creating a more harmonious and integrated taste profile. The herbs rehydrate slowly, releasing their flavors over time. This is why soups often taste better the next day, as the flavors have had more time to develop.
In contrast, when dry herbs are added to sautéed dishes, the high heat causes a rapid release of their volatile oils. This can result in a more intense, immediate burst of flavor. However, this also means that the flavors can dissipate quickly if the herbs are overcooked or exposed to heat for too long. The direct contact with the hot pan or oil accelerates the release of flavor compounds.
To maximize flavor in sautéed dishes, add dry herbs towards the end of the cooking process to prevent them from burning and losing their potency. For soups, add them earlier to allow the flavors to fully develop during simmering.