Seafood Pasta Rosa

Name: Seafood Pasta Rosa
Ingredients: 1 tablespoon olive oil; 2 tablespoons butter; 1/2 cup diced onion; 5 to 6 cloves minced garlic; 1 teaspoon salt; 1/2 teaspoon black pepper; 6 roma tomatoes which have been peeled, seeded and diced; 1/2 cup dry white wine; 3 tablespoons instant flour (Wondra); 4 cups clam juice or shrimp stock or a combination; 1 cup half and half ( or light cream); 1 1/2 pounds peeled and deveined shrimp (I used 31-40 size); 1 1/2 pounds sea scallops, cut in half horizontally if extremely large; 1 cup minced fresh herbs (basil, oregano and parsley); 1 pound spaghetti or linguini; Grated parmesan cheese for serving(optional)