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Have had this experience in Barca.
First night, ridiculously expensive mediocre tasting meal on the Ramblas.
Next night, little place on a back street that had no frontage, just a door with a (Spanish) menu beside it. Funny looks when we walked in but amazing veal and chips, creme Catalan and non stop beer, all served at the bar coz thats about all there was and I’m pretty sure that we put in €10 each and the barman/waiter/chef was pretty happy with his tip!
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Similar experience in Barcelona, found a vegetarian tapas place near where my hotel was, crazy cheap, amazing food and then they gave us free booze because they had to move us before the last course to accommodate a larger group (we didn't mind, there was only 2 of us)
Left there and found a non descript bar that had quite an extensive rum selection. Got leathered and spent minimal Euro.
I keep meaning to go back.
The Italian food rule for a tourist is as follows:
If the establishment looks like a restaurant...the food will be mediocre.
If the establishment looks like a launderette, a hovel, a poly tunnel, a cave, a shed and the food is served on a polystyrene plate and the menu is extremely limited, ..the meal served will most likely make you cry it will be so good.