In a large saute pan melt together the olive oil and butter over medium heat. Add the garlic and onion and cook for about 5 minutes, until the onion becomes transluscent. Add the red pepper flakes.
Tip the mussels itnto a large bowl filled with cold water and sprinkle in the flour. Set to one side.
Add the white wine to the pan with the onions and garlic. Cook until well reduced, about 4 minute.
When the liquid in the pan has reduced down to about a tablespoon, stir in the marinara sauce along with a pinch of salt and pepper.
Drain and rinse the mussels and tip them into the pan. Cook for about 10 minutes, until the mussels have opened up. Discard any the have not opened.
Serve directly from the pan or, if preferred in serving dishes together with the sauce. Garnish with the parsley.
Course: Dinner, Soup
Cuisine: Italian
Keyword: Chili sauce, italian, marinara, mussels, seafood, shellfish