Breaded Oven-Baked Tofu with Portobello Mushroom Gravy

Chinese-style tofu—with its firm, spongy texture—is packaged in tubs filled with water, or it is vacuum-packed in clear plastic and must be refrigerated. Because most marinades contain an acid ingredient such as vinegar, citrus juice or wine, marinating should always be done in a nonreactive bowl made of glass or ceramic. Look for breadcrumbs that do not contain partially hydrogenated oil.