If you want to try a lot of good food from Catalonia, El Tiberi is a great place to go. By buffet, this restaurant is not at all like an American chain. Lots of freshly cooked food is placed on a serving table in large skillets and serving trays. I would estimate that about 15 different dishes were served simultaneously. I went with about 10 other colleagues around the opening time and was greeted by a kind waitress (who only spoke Spanish and Catalan) and lots of food straight out of the oven.
Another perk about El Tiberi is that if you don't see a (tapas) dish that you want, you can request it and the chef will provide it to you in about 15 minutes. And there's no extra cost! The prices were very reasonable for the quality of food.
The only thing is to watch out for the opening times, especially during the winter. The restaurant is typically open from Tuesdays to Saturdays at night from 8:00pm-11:00pm. From other reviews, I thought that it was completely closed during the winter. I sent an email to El Tiberi and they gave me a quick reply. I would recommend asking, too, if you're unsure.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.