We found this restaurant in Ueno that serves Kobe beef. It's a world famous type of Wagyu (Japanese beef) that comes from the Tajima strain of Japanese Black cattle raised strictly in Kobe, thus the name. Due to it's strict cattle raising procedure, Kobe beef is very expensive. The marbling is very high creating a buttery texture. The meat is very tender and almost melts in your mouth so you must try this at least once.
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From @logen9f