1Spray 4-quart Dutch oven with cooking spray. Add onions and garlic; cook over medium heat about 5 minutes, stirring occasionally, until onions are tender. Stir in tomato, carrot, broth, clam juice, pasta, wine, thyme, dill weed and pepper sauce. Heat to boiling. Reduce heat; cover and simmer about 20 minutes, stirring occasionally, until pasta is almost tender.
2Meanwhile, discard any broken-shell or open (dead) mussels. Scrub remaining mussels in cold water, removing any barnacles with a dull paring knife. Pull beard by giving it a tug (using a kitchen towel may help). If you have trouble removing it, use a pliers to grip and pull gently. Place mussels in large container. Cover with cool water. Agitate water with hand, then drain and discard water. Repeat several times until water runs clear; drain.
3Stir in mussels and remaining ingredients into Dutch oven. Cover and heat to boiling; reduce heat. Simmer 6 to 8 minutes, stirring occasionally, until fish flakes easily with fork and mussel shells have opened, removing mussels as they open. Discard any mussels that don't open. Return opened mussels to stew.