If you can get the tuna to be just a tad pink right in the center, you'll discover a smoothness that silk wishes it could achieve. The longer the tuna marinates, the better this will be. Try overnight to 24 hours if you've got the time. Enjoy!
1/4 cup orange juice
1/4 cup soy sauce
2 tablespoons olive oil
1 tablespoon lemon juice
1 tablespoon dried parsley
1 clove garlic, minced
1/2 teaspoon dried oregano
1/2 teaspoon ground black pepper
4 (4 ounce) tuna steaks
1. In a large non-reactive dish, mix together the orange juice, soy sauce, olive oil, lemon juice, parsley, garlic, oregano, and pepper. Place the tuna steaks in the marinade and turn to coat. Cover, and refrigerate for at least 30 minutes.
2. Preheat grill for high heat.
3. Lightly oil grill grate. Cook the tuna steaks for 5 to 6 minutes, then turn and baste with the marinade. Cook for an additional 5 minutes, or to desired doneness. Discard any remaining marinade.