In the Viet kitchen, tuong refers to various heady sauces made from fermented beans. It might be thin like soy sauce, which some folks call nuoc tuong (tuong water), or thick like this sauce, which accompanies Southern Salad Rolls (page 32), Beef and Jicama Hand Rolls (page 30), chicken meatballs (page 86), and Delightful Crepes (page 277). There are several ways to prepare this sauce, and my family’s version is based on nuoc leo, a sweet and earthy sauce from central Vietnam made with pork liver. We substitute lighter-tasting chicken livers, which are saved from whole chickens used for other dishes. Sweet hoisin sauce tempers the chile and garlic, while tomato paste brightens the sauce, which otherwise would be dull brown. At Vietnamese restaurants, this sauce is often called peanut sauce and made with peanut butter, a nontraditional ingredient. It is convenient and tasty, but not as complex and deeply flavored as this liver version. If you do not like liver or are a vegetarian, make the version in the Note that follows.
For a vegetarian version, substitute 2 tablespoons creamy salted peanut butter (preferably an all-natural brand) for the liver. Whisk together the peanut butter and the 2 tablespoons water and proceed as directed. The sauce may be quite thick, in which case you can omit the cornstarch binder.
