Miso is Japanese fermented soybean paste used to flavor many dishes, in addition to the familiar soup at sushi restaurants. There are dozens of varieties. Look for yellow miso, a mild, somewhat earthy, and almost sweet version that is often available in the produce section of large supermarkets. Try this thick rub on salmon fillets, dark-meat chicken, pork, tofu steaks, or eggplant slices. When grilling salmon, cook it skin side down the entire time without turning.