The secret is in the sauce

Name: The secret is in the sauce
Ingredients: 4 (6-ounce) center-cut tuna steaks, about 1-inch thick; 6 tablespoon olive oil, divided; 4 sprigs fresh thyme (or 2 teaspoons dried); 2 crumbled bay leaves; 4 small sprigs fresh rosemary (or 2 teaspoons dried); 1/8 teaspoon red pepper flakes; 4 ripe plum tomatoes; 1/2 cup sliced fennel; 1/2 cup sliced red onion; 2 teaspoon coarsely chopped garlic; 4 pitted black olives; 2 teaspoon grated lemon rind; 2 tablespoon red wine vinegar; 4 tablespoon coarsely chopped fresh basil or parsley; salt and freshly ground pepper to taste