In Spain, this sauce is made with roasted tomatoes and ñora chiles, which can be difficult to source in the U.S. This recipe calls instead for guajillo chiles, the dried form of mirasol chiles. They have a nuanced, fruity flavor with mild heat, giving this romesco more depth than one using only red bell peppers.
2 oz dried guajillo chiles, stemmed and seeded
8 oz (about 2 medium sized) raw red bell peppers
2 oz skinned hazelnuts
4 oz whole peeled canned tomatoes, drained
¼ cup olive oil, plus extra for storing
2 cloves garlic, finely chopped
1 tablespoon sherry vinegar
2 teaspoons smoked paprika
1½ teaspoons kosher salt, or to taste
⅓ cup whole unsalted almonds
2 large red bell peppers, roasted and peeled* OR one (12-oz) jar roasted red peppers, drained
2 tablespoons extra virgin olive oil
2 teaspoons smoked paprika
¼ teaspoon cayenne or other hot pepper
Splash of sherry vinegar
Salt