Grilled Halibut and Tomato Packets

Name: Grilled Halibut and Tomato Packets
Yield: 6 Servings
Ingredients: 6 3/4-inch-thick halibut fillets; 1/4 cup olive oil; 1/4 cup olive tapenade; 3 medium heirloom tomatoes, each cut into 8 wedges; 1 medium fennel bulb, halved, cored, thinly sliced (about 2 cups); 2 tablespoons chopped fresh tarragon; 2 tablespoons grated lemon peel; 1/4 cup dry vermouth