Calçots are a type of green onion that is native to Catalonia. They are typically grilled until charred and served with a romesco sauce, which is made from roasted red peppers, tomatoes, almonds, and garlic. Calçots are a seasonal delicacy, and the traditional way to enjoy them is at a calçotada, a festive gathering where people gather to eat calçots and other grilled meats. If you visit Barcelona during the calçot season (January to April), don't miss the opportunity to try this unique Catalan dish.