Fill a large pot with salted water and cook the pasta shells according to package directions. Drain and rinse and set aside.

Cut the shells of the lobster tails down the center with a sharp knife or strong scissors. Gently pull the lobster up and over the shell. Clean the tail of the digestive tract. Brush lightly with 1 Tbsp. butter and place on a rimmed baking sheet. Broil for 5-7 min. until just cooked through, the meat will become soft and white. Allow to cool and then cut into bite sized pieces. Place in a medium sized bowl.

Meanwhile, in a medium skillet add the 1 tbsp. butter and saute the onion and red pepper for 1 min. Add the shrimp and continue to saute for about 3-4 min. until just pink and cooked. Add the Old Bay seasoning and pepper. Set aside.

In a small saucepan, melt the 1/4 cup butter and whisk in the flour. Cook for 1 min. while whisking. Slowly add the milk while continuing to whisk. Heat the sauce until bubbly and thickened. Season with freshly ground pepper, salt, nutmeg and hot sauce. Stir in Parmesan until melted. Set aside.

Add the shrimp mixture to the lobster, along with the egg, mozzarella cheese, and ricotta cheese. Mix gently.

Preheat oven to 350F. Grease a 9x13" pan. Stuff each shell with one rounded Tbsp. of the seafood mixture and place in pan. Pour cheese sauce over the shells. Sprinkle on more Old Bay seasoning on the top. Bake for 30-35 min. until slightly browned and bubbly. Serve topped with green onions if desired.