Ingredients

• ¼ cup olive oil
• 2 Tbsp red wine vinegar
• 2 Tbsp chopped basil
• 2 tsp chopped fresh thyme
• 2 tsp dried tarragon
• 2 large garlic cloves, finely chopped
• 1/3 cup Mayonnaise
• 4 7oz tuna steaks, 1 inch thick

Directions

1. Whisk first 6 ingredients in shallow dish for marinade. 
2. Place mayonnaise in separate small bowl.   Whisk in 1 ½ Tbsp marinade to make aioli.  Set aioli aside.
3. Sprinkle fish with salt and pepper.
4. Place fish in marinade dish, turning to coat evenly. Marinate at room temperature 1 hour, turning dish occasionally.
5. Oil grill rack. 
6. Prepare barbecue to medium high heat. 
7. Grill fish to desired doneness about 3 minutes per side for medium.
8. Top fish with aioli and serve.