Marmite: Strange Brew
Popular in Britain as a pungent spread for toast, Marmite has nearly twice the umami-producing glutamates of any other item on this page. Its sour, beefy flavor makes it an acquired taste, but we've found that it contributes meaty, long-simmered flavor to quick-cooked soups. Use a light hand — 1/4 teaspoon per serving. Find it in the international aisle of the grocery store or online.