I went to Barcelona this Hollidays and eat in some of this bars. Some of them were really good.
If you are open-minded I also would like to recommend to check this page http://www.visitum.com/barcelona/panoramic-tour-and-gourmet-meal-with-gourmet-bus-dinner-deluxe/48
I booked a panoramic tour with a gourmet meal in a bus. I enjoyed of the best views of Barcelona in a tour that combines visits to the city's most distinctive beauty spots with an haute cuisine meal.