Espinaler Romesco Sauce is rich, nutty, bright, and sweet. And this must-have condiment will quickly and dependably elevate just about anything you take off the grill. First created in the Tarragona Province in Northwestern Spain, romesco sauce is best known for being used to dunk giant grilled green onions called calçots during their annual harvest festival in between guzzling streams of red wine from a communal porrón. -Copy modified from A Priori