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1/4 cup reduced-sodium soy sauce
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3 tablespoons brown sugar
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3 tablespoons olive oil or canola oil
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2 tablespoons white wine vinegar or cider vinegar
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2 tablespoons sherry or chicken broth
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2 tablespoons unsweetened pineapple juice
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1 1/2 teaspoons ground ginger or 2 tablespoons minced fresh gingerroot
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4 tuna steaks (6 ounces each)
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