Final answer:
Adding spices such as parsley or oregano to a sauce can improve its flavor, as spices enhance our sensory experience of food by altering tastes and adding complexity.
Step-by-step explanation:
The addition of spices and herbs like parsley and oregano can enrich the flavor profile of dishes, making them more appealing to our taste buds. Salt, specifically, enhances flavor by reducing bitterness, thereby bringing out the other flavors in food. When considering the sauce mentioned by Javier, using parsley could impart a fresh flavor to dishes, while oregano would provide a warm, aromatic taste that is often associated with Italian cooking. Adding either one should be based on the desired end flavor as well as the compatibility with other ingredients in the sauce.