Kosher salt
2 tablespoons unsalted butter
4 slices bacon, diced
2 shallots, chopped
1 cup dry white wine
1/4 teaspoon red pepper flakes
1 28-ounce can whole San Marzano tomatoes
12 ounces spaghetti or bucatini
1/4 cup fresh parsley
1 large clove garlic, smashed
2 pounds mussels, scrubbed and debearded