Instructions: 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 400 F.

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.

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