This is a fantastic restaurant with a great ambiance and wonderful service. I grew up in Bolivia and I can tell you that this food is definitely authentic and delicious - unlike any other Bolivian restaurants I've tried here in the US (there is another good one in San Francisco called Pacha Mama). As for Papa a la Huancaina - the previous reviewer is mistaken. Papa a la Huancaina is very much a Bolivian dish, can be found in nearly all Bolivian recipe books, and one of my favorites growing up. :-) Peru and Bolivia share many dishes and others have slight variations - shouldn't be surprising but what is important is that they have rich and amazing flavors and Copacabana really knows how to offer that in their dishes.
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