- In a medium bowl, whisk together olive oil, garlic, tarragon vinegar, dried tarragon and pepper. Place tuna steaks into the mixture. Cover and marinate in the refrigerator at least 4 hours.
- Preheat an outdoor grill for high heat and lightly oil grate.
- Grill tuna steaks 8 to 10 minutes per side, until the tuna flakes easily and is opaque in the center.
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