Juicy mussels are stuffed with a savory breadcrumb filling, simmered gently in a rich tomato sauce, and served with crusty bread to soak up every drop.
Scrub the mussels under cold water and remove the beards. Discard any that are open or broken.
In a large pot, heat 1 tablespoon of olive oil and sauté one garlic clove. Add mussels, cover, and steam for a few minutes until they just start to open. Remove from heat and let cool slightly. Open each mussel carefully without detaching the halves.
Soak the stale bread in milk or water for a few minutes, then squeeze out the excess. In a bowl, mix the bread with egg, Parmesan, garlic, parsley, salt, and pepper until combined.
Take a small amount of stuffing and gently press it between the two shells of each mussel. Don’t overfill—just enough to bind the shells together slightly.
In a wide skillet or pan, heat the remaining olive oil and garlic. Add tomato passata and white wine. Season with salt and pepper and bring to a simmer.
Gently place the stuffed mussels in the sauce. Cover and simmer for 15–20 minutes on low heat.
Transfer to plates, spoon over extra sauce, and sprinkle with fresh parsley. Serve with crusty bread.
Notes
Use a wide, shallow pan to fit all the mussels in a single layer.
If the sauce reduces too much, add a splash of water to loosen.
You can prepare the stuffed mussels ahead and refrigerate for up to 6 hours before cooking.