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    A Restaurant's Take

    Potato-plus gratin

    Improving on the classic at Grill 23 & Bar.

    Yoon S. Byun/Globe staff

    Potato gratin at Grill 23 & Bar, served as a side with a seared tuna entree, has an unusual addition. Along with the layers of potato are layers of fresh-tasting celery root; the dish is made with creamy bechamel sauce, and served with bread crumbs on top.  — Rachel Travers

    GRILL 23 & BAR 161 Berkeley Street, Boston, 617-542-2255,