Creamy Seafood Lasagna with Shrimp & Crab

Yield: 12 generous servings
Prep Time: 45 minutes
Cook Time: 1 hour (plus 30 minutes resting)
Total Time: About 2 hours 15 minutes
Difficulty: Medium/Advanced
Intensity: High Effort, Project Cooking – This is a multi-component recipe requiring careful sauce-making, seafood preparation, and layered assembly. It’s a rewarding project for a confident home cook.

Ingredients

For the Seafood & Aromatics:

4 tablespoons (½ stick / 57g) unsalted butter, divided
1 medium shallot, finely minced
3 cloves garlic, minced
1 lb (450g) raw large shrimp (21/25 or 26/30 count), peeled, deveined, tails removed, chopped into ½-inch pieces
8 oz (225g) lump crab meat, picked over for shells
¼ cup (60ml) dry white wine (like Sauvignon Blanc) or seafood stock
2 tablespoons fresh parsley, chopped
1 tablespoon fresh lemon juice
Salt and white pepper, to taste

For the Creamy Béchamel Sauce:

6 tablespoons (85g) unsalted butter
¾ cup (90g) all-purpose flour
5 cups (1.2L) whole milk, warmed
1 cup (100g) grated Parmesan cheese
¼ teaspoon freshly grated nutmeg
Salt and white pepper, to taste

For the Ricotta Filling:

32 oz (907g) whole milk ricotta cheese
1 large egg, lightly beaten
½ cup (50g) grated Parmesan cheese
¼ cup fresh parsley, chopped
1 teaspoon lemon zest
½ teaspoon salt
¼ teaspoon black pepper

For Assembly:

1 (16 oz) box no-boil (oven-ready) lasagna noodles
3 cups (340g) shredded Italian cheese blend (mozzarella, provolone, Asiago) or just mozzarella
Extra grated Parmesan for topping
Butter or non-stick spray for greasing

Optional Garnish: Fresh dill or chives, lemon wedges

Equipment

Large, deep skillet or sauté pan
Large saucepan (for béchamel)
Large mixing bowls
Whisk
9×13 inch (deep) baking dish
Aluminum foil

Step-by-Step Instructions

Part 1: Prepare the Seafood Filling

In a large skillet over medium heat, melt 2 tablespoons of butter. Add the minced shallot and cook until soft and translucent, about 3-4 minutes. Add the garlic and cook for 1 more minute until fragrant.
Increase heat to medium-high. Add the chopped shrimp in a single layer. Season lightly with salt and white pepper. Sauté for 2-3 minutes, stirring occasionally, until the shrimp are just opaque and pink. Do not overcook.
Gently fold in the lump crab meat. Pour in the white wine (or stock) and lemon juice. Let it simmer for 1 minute to reduce slightly. Remove from heat.
Stir in the fresh parsley. Transfer the entire mixture to a bowl, including all the buttery juices. Set aside to cool slightly.

Part 2: Make the Creamy Béchamel (White Sauce)

This is the foundation of the lasagna—patience is key.

In a large saucepan, melt the 6 tablespoons of butter over medium heat. Once foaming subsides, whisk in the flour. Cook, whisking constantly, for 2-3 minutes until the mixture (roux) is bubbly and pale blond. It should smell nutty, not raw.
Gradually add the warmed milk, about 1 cup at a time, whisking vigorously and continuously until completely smooth after each addition.
Once all milk is added, continue to cook, whisking often, until the sauce thickens to a heavy cream consistency and coats the back of a spoon, about 8-10 minutes. It should just come to a gentle simmer.
Remove from heat. Whisk in the 1 cup of grated Parmesan and the nutmeg. Season generously with salt and white pepper. The sauce should be highly seasoned. Set aside, covering the surface directly with plastic wrap to prevent a skin from forming.

Part 3: Prepare the Ricotta Filling

In a large bowl, combine the ricotta, beaten egg, ½ cup Parmesan, chopped parsley, lemon zest, salt, and black pepper. Mix until well blended. Set aside.

Part 4: Assemble the Lasagna

Preheat oven to 375°F (190°C). Grease your 9×13 inch baking dish.
Spread a thin layer of béchamel (about ¾ cup) on the bottom of the dish. This prevents sticking.
First Layer: Place a single layer of no-boil noodles over the sauce (approx. 4-5 noodles). Spread half of the ricotta mixture evenly over the noodles. Sprinkle one-third of the seafood mixture over the ricotta. Drizzle about 1 ¼ cups of béchamel over the seafood. Sprinkle with 1 cup of shredded cheese.
Second Layer: Add another layer of noodles. Spread the remaining ricotta mixture, followed by another third of the seafood, another 1 ¼ cups of béchamel, and 1 cup of shredded cheese.
Third Layer: Add a final layer of noodles. Top with the remaining seafood, then pour the remaining béchamel over everything, ensuring all noodle edges are covered. Sprinkle the remaining 1 cup of shredded cheese and an extra dusting of Parmesan over the top.

Part 5: Bake to Golden, Bubbly Perfection

Cover the dish tightly with greased aluminum foil (greased side down to prevent cheese from sticking).
Bake on the middle rack for 40 minutes.
Remove the foil and bake, uncovered, for an additional 20-25 minutes, or until the top is golden brown and the edges are bubbling vigorously.
The Crucial Rest: Remove from the oven and let the lasagna rest, undisturbed, for at least 30 minutes before cutting. This allows the layers to set, ensuring clean, defined slices.

Part 6: Serve

Garnish with fresh dill or chives. Serve with lemon wedges on the side for a bright, optional squeeze.

Serving Suggestions & Expert Tips

Serve With: A simple, crisp green salad with a lemon vinaigrette and warm, crusty bread to soak up any sauce.
Lobster Upgrade: Substitute 4 oz of the crab meat with chopped cooked lobster tail meat.
Scallop Addition: Add ½ lb of bay scallops, sautéed with the shrimp.
Herb Variation: Use tarragon in place of parsley for a more classic French flair.
Make-Ahead: Assemble the entire lasagna up to 24 hours in advance. Cover and refrigerate. Bake directly from the fridge, adding 10-15 minutes to the covered bake time.
No-Boil Noodle Note: Ensuring every noodle is completely surrounded by sauce is critical for proper hydration. Press down gently on the final layer before adding the last of the béchamel.

Storage & Shelf Life

Refrigerator: Store cooled leftovers, covered, for up to 4 days.
Freezer (Unbaked): Assemble, wrap tightly in both plastic wrap and foil, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking as directed.
Freezer (Baked): Portion and freeze in airtight containers for up to 2 months.
Reheating: Reheat individual portions, covered, in a 350°F oven until warmed through (20-25 mins) or microwave gently. The oven method preserves texture best.

The Last Piece: The center square of this lasagna is the treasure. It’s where the creamy layers are at their deepest and most intact. Each forkful reveals a perfect strata: a tender noodle, a pillow of seasoned ricotta, sweet bursts of crab and shrimp, all bound by the rich, nutty béchamel. It’s a luxurious, comforting mouthful that justifies every minute of preparation—a celebration of the sea in the most decadent, homey form imaginable.

Nutritional Information (Per Serving, approx. 1/12th of lasagna)

Calories: ~650 kcal
Total Fat: 38g
- Saturated Fat: 22g
Cholesterol: 195mg
Sodium: 900mg (varies; use low-sodium broth and cheese to control)
Total Carbohydrates: 38g
- Dietary Fiber: 2g
- Sugars: 9g (lactose from dairy)
Protein: 38g

Note: Nutritional information is an estimate. Values will vary based on specific brands of cheese, seafood, and pasta. This is a rich, celebratory dish.