Creamy Seafood Bisque

Name: Creamy Seafood Bisque
Prep time: 25 min
Cook time: 25 min
Total time: 50 min
Cuisine: European
Ingredients: 1/2 cup butter, cubed; 1 medium red onion, chopped; 1 cup sliced fresh mushrooms; 2 garlic cloves, minced; 1/2 cup all-purpose flour; 1 teaspoon salt; 1 teaspoon coarsely ground pepper; 2 tablespoons tomato paste; 1 carton (32 ounces) chicken broth; 2 cups whole baby clams, drained; 1/2 pound uncooked medium shrimp, peeled and deveined; 2 cups lump crabmeat, drained; 2 cups heavy whipping cream; 1/2 cup shredded Parmesan cheese; 2 green onions, thinly sliced