Flavor Variations: For a spicier version, add more cayenne pepper or a small hot chili pepper when blending the sauce. You can also use different types of vinegar to adjust the flavor profile.
Storage Tip: Store the Romesco sauce in an airtight container in the refrigerator for up to 5 days. To preserve the sauce's freshness, pour a thin layer of olive oil on top before sealing the container. You can also freeze it for up to 3 months.