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