
Koisan Sushi
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An Old Towne Orange institution since 1982, Koisan Sushi is one of Orange County most enduring Japanese restaurants, now on its second generation of family ownership. Japanese-style lanterns and specialized craftsman woodwork create an atmosphere that feels genuinely transported from Japan. The fish selection is consistently fresh and the nigiri platters showcase traditionally precise technique. Start with the miso soup and order the nigiri selection.