Combine scallops, shrimp, chopped spinach, and diced red bell pepper.
Bring large pot of water to boil and add chopped onion and celery for flavor. Add 6 ounces fettuccini to the boiling water and cook to al dente.
Meanwhile, put olive oil in saute pan and heat over medium-high heat. Then add shrimp, scallops, clams, chopped spinach, and diced red bell peppers. Saute for approximately 5 minutes.
When fettuccini is done, drain. Drop mussels in the boiling water after removing fettuccini. Cook until mussels are open and tender, approximately 1 1/2 to 2 minutes, then drain and combine mussels with ingredients in the saute pan. Add the Alfredo Sauce to the pan and continue cooking for about 2 minutes.
Add fettuccini to pan and toss until well combined. Plate, sprinkling top with freshly chopped parsley and garnish with lemon twist. Grind fresh pepper and salt if desired.
Melt the butter in a saucepan over medium-low heat. Add the cream and simmer for 5 minutes, then add garlic, cheese, and cayenne and whisk quickly, heating through. Stir in parsley and serve.
For a lower fat version, substitute 1 cup milk and 1/4 cup flour separately, instead of heavy cream.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of The Globe and Laurel