The oldest eatery being Botin in Madrid which was founded in 1725.
The Can Culleretes was established in 1786, just a mere 10 years after the American Revolutionary War.
This was the first place I dined when I came to Barcelona and the first time I tasted espinacas a la catalana.
What a wonderful blend of flavors. I never thought spinach could taste so GREAT!
Try their prawns with garlic flavor. You won't be disappointed.
Hmmph! I can't end this post without telling you about a desert to die for. It was trufa with wonderful chocolate melted over it. Even now I can taste it.
But there's a downside too. The restaurant hits and misses on their cooking from time to time. If you find this to be true, go back. Maybe someone had a bad night.
Also, the price is a little hefty for my taste to make the Culleretes my favorite hot spot on a consistent basis.
Here's a direct link to their own site translated into English, Catala and Castellano.
If you go there, let me know what you think!