Lasagna:

• 9 lasagna noodles

Seafood Mixture:

• 2 tablespoons olive oil
• 1 small onion, finely chopped
• 3 cloves garlic, minced
• 1/2 pound shrimp, peeled and chopped
• 1/2 pound scallops, chopped
• 1/2 pound lump crab meat (drained if canned)
• 1/4 teaspoon salt
• 1/4 teaspoon black pepper
• 1/4 teaspoon crushed red pepper flakes (optional)

White Sauce:

• 3 tablespoons all-purpose flour
• 2 cups whole milk
• 1/2 cup heavy cream
• 1/2 cup grated Parmesan cheese
• 2 cups shredded mozzarella cheese
• 1 cup ricotta cheese
• 2 tablespoons chopped fresh parsley
• 1 teaspoon lemon zest