Grilled Tuna with Herbed Aioli

Ingredients

 * ¼ cup olive oil
 * 2 tablespoons red wine vinegar
 * 2 tablespoons chopped fresh basil
 * 2 teaspoons chopped fresh thyme
 * 2 teaspoons dried tarragon
 * 2 large garlic cloves, finely chopped
 * ⅓ cup mayonnaise
 * 4 x 7-ounce tuna steaks (each about 1 inch thick)

Directions

 * 1) Whisk together first 6 ingredients in shallow dish for marinade.
 * 2) Place mayonnaise in separate small bowl.
 * 3) Whisk in 1½ tablespoons marinade.
 * 4) Set aioli aside.
 * 5) Sprinkle fish with salt and pepper.
 * 6) Place fish in marinade in dish, turning to coat evenly.
 * 7) Marinate 1 hour at room temperature, turning fish occasionally.
 * 8) oil grill rack.
 * 9) Prepare barbecue (medium-high heat).
 * 10) Grill fish to desired doneness, about 3 minutes per side for medium.
 * 11) Top fish with aioli and serve.