Savory Fish Fillets

Ingredients

• 1 large onion, cut in halves, thin sliced
• 2 tablespoons capers
• 12 large black olives, quartered
• 3 bay leaves
• 1 pinch of thyme
• 1 pound peeled tomatoes, crushed
• 12 ounces white wine
• salt and pepper to taste
• 4 fish fillets
• 1 tablespoon olive oil
• 2 tablespoons butter
• 6 ounces white wine for cooking fish
• parsley, chopped