Calçots are a type of green onion that is native to Catalonia. They are typically grilled over an open flame until charred and served with a romesco sauce. Eating calçots is a social event in Catalonia, where people gather around long tables to enjoy this seasonal delicacy. The charred outer layer is peeled off, revealing a tender and sweet inner layer. Dip the calçots in the romesco sauce and savor the smoky and tangy flavors. If you visit Castelldefels during the calçot season (January to April), make sure to try this unique Catalan specialty.