Add all the ingredients to the bowl of a food processor. Blend to a smooth consistency, scraping the bowl down a few times along the way. Taste and adjust the seasoning, if needed. If the Romesco sauce is a bit thick to your liking, you can loosen it further by adding a few tablespoons of water or vegetable broth and blend again until incorporated and smooth.
STORAGE: Refrigerate Romesco sauce in a jar or an airtight container for up to 1 week. Do not freeze.
SERVING: Serve Romesco sauce over grilled meat, fish, or roasted vegetables, as a spread in sandwiches or over toasted baguette slices, or as a dip with crunchy vegetables and crackers or pita chips.
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