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2 Navel oranges
1/4 c Orange-juice concentrate
1 tb Chopped fresh thyme
1 ts Soy sauce
2 cl Garlic; minced
1/4 ts Freshly ground black pepper
1 lb 3/4-inch-thick tuna steak;
-cut into 4 portions
1/4 lb Shiitake mushrooms; stems
-removed, thinly sliced
-(2 cups)
4 Servings