Inside an unassuming Cambridge brownstone, chef Tim Wiechmann crafts an exquisite changing menu of local and seasonal fare, like an amuse-bouche of thumb-size lobster rolls or tiny Big Ox Farm lettuces with rose-scented vinaigrette and citrus chips. Emphasizing biodynamic wines, house-made charcuterie, and sustainably raised meats, every meal is kind to both planet and palate.