Ingredients available at Asian markets and many specialty foods shops and supermarkets Note: Can be prepared in 45 minutes or less. Make sauce In a large saucepan combine citrus juices, tamari or soy sauce, vinegar, oil, and gingerroot and simmer 15 minutes. Pour sauce through a fine sieve into a bowl. Sauce may be made 1 day ahead and chilled, covered. Reheat sauce before preceeding. Preheat oven to 400DF. In a large non-stick skillet heat oil over moderately high heat until hot but not smoking. Coat 2 tuna steaks with sesame seeds and sear 1 minute on each side, transferring to a baking sheet. Coat and sear remaining 4 tuna steaks in batches in same manner. Cook tuna in middle of oven 3 minutes for medium-rare. Cut each tuna steak into 4 slices and arrange slices, cut sides up, on 6 plates. Pour about 1/4 cup sauce around tuna on each plate. Serves 6.

Make enough for leftovers for wonderful salad. Add a little olive oil and balsamic vinegar to the sauce for salad dressing. Make salad of mixed greens, cubed avacado, canned mandrin orange and grapefruit sections (drained). Divide sauce and put 1/2 on tuna chunks in large salad bowls, toss greens and avocado chunks with the remaining sauce, and arrange tossed greens around tuna chunks, and arrange citrus around the edge of the bowls. Serve with fresh bread or heated Ciabatta rolls.