In a small bowl, whisk together lemon zest, lemon juice, olive oil, and garlic. Stir in 2 tablespoons fresh basil and capers. Season vinaigrette to taste with salt and pepper. NOTE: Can be prepared 1 hour ahead. Let stand at room temperature until ready to use.
Prepare barbecue (medium-high heat) or preheat broiler. Season halibut steaks with salt and pepper. Brush halibut with lemon vinaigrette, dividing equally.
Grill or broil halibut steaks approximately 4 minutes per side or until a meat thermometer registers an internal temperature of 140 degrees F (halibut will be slightly opaque in thickest part). Remember the halibut continues to cook after it is removed from the heat source.
Approximately cooking times for halibut:
1/4 to 1/3-inch - 3 to 4 minutes
1/2 to 3/4-inch - 4 to 6 minutes
1 to 1 1/2-inch - 8 to 12 minutes
Carefully transfer fish to individual serving plates. Whisk remaining lemon vinaigrette; pour over fish. Garnish cooked halibut with remaining 1 tablespoon basil leaves and serve.
Makes 4 servings.
Halibut with Lemon-Basil Vinaigrette Recipe: https://whatscookingamerica.net/halibutlemonbasil.htm