11⁄2 cups toasted and cubed Italian or French bread;
1⁄2 cup blanched almonds, preferably Marcona almonds;
1⁄2 cup hazelnuts;
6 garlic cloves;
1 cup seeded and chopped tomatoes;
1 teaspoon crushed red pepper flakes, or to taste;
1 cup coarsely chopped roasted sweet red peppers;
1 tablespoon chopped fresh rosemary;
1 tablespoon chopped fresh oregano;
1 teaspoon sugar;
1 teaspoon kosher salt, plus more to taste;
1⁄4 teaspoon ground black pepper, plus more to taste;
1 teaspoon smoked paprika (pimentón);
1⁄4 cup sherry vinegar;
1⁄4 to 1⁄2 cup extravirgin olive oil.
How to make
Southern Romesco sauce
Place the bread, almonds, hazelnuts, garlic, and tomatoes in the bowl of a food processor fitted with a metal blade and pulse to break them up roughly.
Add the red pepper flakes, roasted peppers, rosemary, oregano, sugar, salt, pepper, smoked paprika, and vinegar. Pulse until the nuts are finely ground.
With the machine running, gradually pour in enough of the oil to make the sauce the consistency of very thick salad dressing that can hold its shape on a spoon. Do not overprocess; small bits of nuts should remain visible. Taste to make sure the sauce has plenty of piquancy and enough salt and adjust the seasoning if needed.
Make-ahead note: The sauce can be made up to 3 days ahead. Store tightly covered and refrigerated for up to 1 week. Stir well, check the seasoning, and return to room temperature for serving.