With a cloth towel, wipe the mullets dry. Season the flour with salt and pepper. Roll the mullets in the flour. In a large saute pan, heat the olive oil. When the oil is hot, add the mullets and pan-fry the mullets for about 3 to 4 minutes on each side or until golden. Add the garlic, onions, bay leaf, thyme, and tomatoes. Season with salt and pepper. Bring the liquid up to a simmer and cook for about 5 minutes. Garnish the mullets with parsley.