Step 1Heat oil in 10-inch skillet over high heat until it smokes. Carefully add mussels, cockles, shrimp, calamari, scallops, garlic, parsley and pepper flakes and saute until all shells are open, 3 minutes, stirring twice. Add wine and cover. Cook 1 minute. Add tomato sauce. Cover, then shake and stir over medium heat until bubbly and hot, 3 to 5 minutes. If sauce appears too thick, add 2 tablespoons wine. Serve over cooked pasta.