Andrew Hill
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This place was recommended by a tour guide. She said it was famous for its tortilla española (spanish potato omlette) which comes for free when you order a drink. She said that during the high season, the people line up down the street, so be careful.
We showed up and went inside - we asked a waiter about getting a table and he said to go to the bar to put our names on the list. They will ask you if you want to sit inside, outside, or "egual" - we asked for a table inside because it was pretty chilly that day.
As soon as we sat down and ordered our first drink, a vermouth, we were almost immediately served with a nice slice of tortilla with a little piece of bread in a little ceramic bowl. It was a good tortilla - it was made with caramelized onions, which is just how I like it. While it was great, I didn't feel like it was better than I had eaten elsewhere (I like the free one at Bar Caña Hueca better, and they have a great selection of vermouth to boot). Still, if you are hungry and on a budget, you could pop in here for a beer and satisfy your hunger for free. We saw one younger dude do just that - he came in solo, grabbed a beer, ate his tortilla and left.
After the tapa, we wanted to try a couple of things. We ordered their fried calamari, which was served on a bed of french fries - that combination really worked. Their croquettes were amazing and basically as good as the ones we had tried at the Michelin starred Simpar (which won an award for best croquette in Spain). Highly recommend their croquettes - we got the jamon ones. Next we wanted to try something different and went with (I forget the name) breaded chicken cutlet which was pounded thin and friend that came with a salad. This wasn't anything unusual, but it was hearty.
We finished our meal sharing a dessert. They had a coffee flan that day. One of them was more than big enough to share and it was also excellent. Overall good vermouth, good beer, good to great bar food and excellent dessert. Definitely worth a stop - just head to the front and put your name in. Then you can hang around outside until they come out and shout your name.