Just returned from my unfortunately way too short of a trip to Barca -- it was amazing in all respects and the food was great! Some of the highlights were El Xampaniet tapas place in Barri Gotic (near Picasso museum) and Pinoxo bar (sp?) in Boqueria -- both family run, with very friendly people who just want to feed you! And the food is amazing.
Tried one of the basque tapas place (where you just take whatever pinxos you want and then pay by the number of toothpicks on the plate (each 1.30euro), Sagradi, it was fun. Txacali (Basque white wine) alone is worth a stop and the atmosphere was really fun.
Haven't seen this mentioned before but if you hear people ordering xuxas (chuchas) try one! It's an amazing pastry with coated in cinnamon sugar and filled with cream (had one in Pinoxo for breakfast on Saturday, but they didn't have any on Monday -- maybe it's the weekend thing?) Goes great with a tallat.
Try xurros amb xocolata of course as they are so delicious and not greasy or heavy (well maybe the xocolata part is a bit heavy, almost pudding like).
In 4 days there the closest I got to a vegetable was pa amb tomaquet (tomato rubbed toast), truita (omelette) with aubergines, and a fantastic wild mushrooms dish (at Pinoxo). Most coffee places have good freshly squeezed orange juice which is a nice way to try to be healthy in the morning (lasts only until the next chorizo you see). The rest of the diet consisted of meats, bread, coffee, and hot chocolate. All liberally washed down by red wine (always got de casa, and was always good), cava (cordoniu, or de casa), and beer (estrella).
Brought back lots of marcona almonds (they cost 1/2 price there as compared to NYC), turron, crema catalana, and some vaccuum packed chorizo, ,jamon, and semi cheese (the sliced would be a better deal but didn't want to risk being stopped at customs). Regret that didn't have space or physical strength to bring back lots of cans of sardines, anchoives, and olives rellenas with anchovies. Oh and allioli sauce (even though it's easy to make).
Now I just don't know how to go back to having bad coffee and hot chocolate in NYC.