Sam Hawk is a personal favorite. I had a roommate in college who spent some time in Korea and expressed that it is authentic and often times better than food he had while in the country. The bul-go-ki is amazing and ridiculously cheap. Not only do I recommend this place I don't know how people go their whole lives without experiencing it. The only down side is the that you walk out smelling like the place but I guess that may not be a bad thing. It is family owned and operated and so if it is busy you may be waiting for a while.
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