2In a saucepan, melt 2 tbsp butter. Add half the garlic and sauté for 1 minute. Add heavy cream, bring to a boil, reduce heat and simmer for 2-3 minutes. Remove from heat and stir in Parmesan, parsley, 1 tsp Cajun seasoning and black pepper. Set aside.
3In a skillet, melt 1 tbsp butter. Add shrimp, 1/4 tsp Cajun seasoning and black pepper. Sauté for 2 minutes. Add langostinos and 1 tsp garlic, sauté for 1 minute. Set aside.
4In the same skillet, melt 1 tbsp butter. Add shallot and sauté for 2-3 minutes. Add spinach and remaining garlic and sauté until wilted. Remove from heat and stir in cream cheese, 1/4 cup mozzarella, 1/4 tsp Cajun seasoning and black pepper. Set aside.
5In an 8x8 baking dish, add enough sauce to cover the bottom. Set aside 1/3 cup of sauce.
6Rinse Palmini lasagna sheets.
7Layer lasagna sheets, spinach mixture, seafood and sauce. Repeat until all ingredients are used.
8Top with remaining sauce and mozzarella. Bake for 10-12 minutes until bubbly.