There is a ton of flavor in this Mussels in Tomato Sauce recipe from start to finish the layers of olive oil, unsalted butter, shallots, garlic, crushed red pepper, San Marzano tomatoes, dry white wine, kosher salt, mussels, flat-leaf parsley, lemon wedges, and french bread to sop up the delectable juices from the Mussels in Tomato Sauce.
Heat the extra-virgin olive oil and unsalted butter in a deep large metal skillet or Dutch Oven over medium-high until butter melts, about 1-2 minutes. Add the finely chopped shallot cook, occasionally stirring until the shallot is translucent, about 5 minutes. Add the finely chopped garlic and the crushed red pepper; cook for about 1-2 minutes. Add the San Marano tomatoes, dry white wine, and kosher salt; bring to a slight simmer.
Add the clean and debearded mussels to the tomato sauce. Cover with a tight-fitting lid and cook until the mussels start to open - 3 to 5 minutes (Discard any mussels that do not open.) Stir in the flat-parsley. Lightly toss, and spoon into eight bowls. Top the mussels with the remaining reserved flat-leafed parsley and lemon wedges. Serve with toasted French bread.