About 9-10 years ago I went to a tasty, loud, crowded and fun restaurant that served what was basically various grilled meats and cheeses on very rustic, small rolls - you'd typically be able to do 3 or 4 of them - and people only seemed to drink cava by the bottle. And man did those bottles fly around! That's pretty much all they seemed to have on the menu, but it was so good you didn't care. It was dirt cheap, and it seemed to be catering to a local crowd. It was somewhere in the old city, north of Las Ramblas, and closer to the water as I recall it. (Though I could be very off on that.)
No idea if it's even there anymore after all this time, but if anyone recognizes the place and can tell me about it, I'd be grateful.