- 1 tablespoon olive oil
- 1 small onion, finely chopped
- 5 cloves garlic, crushed
- 6 large tomatoes, chopped, or more to taste
- 1 cup dry white wine
- 1 (6.5 ounce) can clam juice
- 2 pounds mussels, cleaned and debearded
- 1 cup chopped fresh parsley
- 1/4 cup butter
- Heat oil in a large pot over medium heat. Add onion; cook and stir until translucent, about 3 minutes. Add garlic; cook until fragrant, about 1 minute. Add tomatoes with all their juices. Cook and stir until softened, 3 to 5 minutes.
- Pour wine and clam juice into the pot. Bring to a gentle boil; add mussels. Simmer, covered, until mussels have opened, 4 to 6 minutes. Add parsley. Stir in butter until melted, about 1 minute.