Step 1Combine oil, garlic, green pepper, onion, red pepper flakes and parsley in 8-quart pot. Cook over medium heat until vegetables are soft, about 5 minutes. Add wine, clam juice, tomato puree, whole tomatoes, Roma tomatoes, salt and pepper to taste, oregano and dried basil.
Step 2Bring to boil. Cover, reduce heat and simmer 5 minutes. Turn heat to medium-high and add mussels. Cover and cook until mussels pop open, 3 to 5 minutes. Pile mussels into 8 soup bowls with some of broth. (Discard any mussels that do not open.) Top with fresh basil leaves just before serving.