- ½ cup vegetable oil
- ¼ cup soy sauce
- 3 Tbsp green onions, chopped
- 2 Tbsp dry white wine
- 2 Tbsp fresh lime juice
- 1 Tbsp grated fresh ginger
- 1½ tsp brown sugar
- 2 cloves minced garlic
Combine all ingredients, pour over tuna steaks, and refrigerate 6 to 24 hours (longer is better), turning occasionally. Grill to desired doneness on each side, basting with marinade.