Creamy Garlic Butter Seafood Lasagna with Shrimp and Crab Step-by-step instructions

Before you start

Before starting the assembly and cooking process, organize all ingredients and equipment on your counter. Peel, devein, and chop the raw shrimp into bite-sized pieces if they are large, and pick through the lump crab meat to remove any stray shell fragments.

Pre-cook the lasagna sheets according to package directions, drain them, and lay them flat on parchment paper to prevent sticking. Prepare your bechamel sauce ahead of time so it is smooth, warm, and ready to pour. Grate the cheese and mince the garlic so everything is ready to go.

Instructions

Sautéing the Seafood

1. 1Sauté the Seafood
   Melt the butter in a large skillet over medium heat. Add the minced garlic and sauté for one minute until fragrant. Toss in the raw shrimp, lump crab meat, and seafood seasoning. Cook for three to four minutes, stirring gently, until the shrimp just begins to turn pink and the seafood is fully coated in garlic butter. Remove from heat immediately.
   Look for The shrimp should start turning pink and opaque.
   Tip Do not overcook the seafood here as it will finish cooking in the oven.

At the end of this first phase, the kitchen should be filled with the rich, irresistible aroma of sweet garlic and sizzling butter. The shrimp will have turned a light pink color, and the crab meat will be warmed through and thoroughly coated in the garlic butter. It is crucial to stop sautéing as soon as the seafood is just barely cooked, as it will finish cooking completely in the oven. The mixture should look moist and glossy, ready to be layered.

Assembling the Layers

2. 2Spread the Sauce
   Spread a thin layer of velvety bechamel sauce over the bottom of a 9x13-inch baking dish. Lay three cooked pasta sheets over the sauce to cover the bottom of the dish completely.
   Look for The bottom of the dish should be fully coated.
   Tip Pat the pasta sheets dry with paper towels before placing them in the dish to prevent wateriness.
3. 3Layer the Seafood and Cheese
   Distribute half of the sautéed garlic-butter shrimp and crab evenly over the pasta sheets. Pour one cup of bechamel sauce over the seafood, then sprinkle with one-third of the shredded cheese. Repeat the layers, starting with pasta sheets, then the remaining seafood, bechamel, and another third of the cheese.
   Look for The layers should be evenly distributed and flat.
   Tip Press down gently on the layers to remove any trapped air pockets.

By the end of the assembly phase, the lasagna should be neatly constructed in the baking dish with clearly defined layers. The pasta sheets should lie flat, completely covered by a smooth, even layer of velvety bechamel, followed by a generous distribution of the sautéed garlic-butter seafood and a blanket of shredded cheese.

The final top layer should be a beautiful, clean sheet of pasta topped with the remaining bechamel and a heavy layer of cheese, ready for the oven.

Baking to Golden Perfection

4. 4Bake to Golden Perfection
   Top with the final three pasta sheets, the remaining bechamel sauce, and the rest of the shredded cheese. Bake at 375°F (190°C) for twenty-five to thirty minutes. The lasagna is ready when the cheese is bubbling and golden, and the seafood reaches a safe internal temperature of 145°F (63°C). Let the lasagna rest for fifteen minutes before slicing.
   Look for The cheese should be golden-brown and bubbling vigorously.
   Safe temperature 145°F (63°C) internal temperature (shellfish)
   Tip Letting the dish rest ensures clean, beautiful slices.

At the end of the baking phase, the lasagna will be bubbling vigorously around the edges, and the cheese on top will have transformed into a beautiful, deeply golden-brown crust. Steam should rise gently from the dish, carrying the rich scent of baked seafood and melted cheese. A knife inserted into the center should meet no resistance, indicating the pasta is tender and the entire dish is piping hot and fully set throughout.

Common mistakes

One common mistake is overcooking the seafood during the initial sautéing phase. Because the lasagna bakes in the oven for a significant amount of time, over-sautéing the shrimp and crab will result in a rubbery, tough texture in the final dish.

Sauté them just until the shrimp starts to turn pink. Another mistake is using too much liquid or watery sauces, which leads to a runny lasagna that falls apart when sliced. Ensure your bechamel is thick and velvety, and let the baked lasagna rest before slicing to allow the layers to set.

How to tell it’s done

To determine if the seafood lasagna is perfectly cooked and safe to eat, use a digital food thermometer inserted into the center of the dish. The internal temperature must reach at least 145°F (63°C) to ensure the shellfish is fully and safely cooked.

Visually, the lasagna is done when the sauce is bubbling actively at the edges and the cheese on top is melted, bubbly, and beautifully browned. After removing it from the oven, let it rest for at least fifteen minutes so the layers can firm up for clean slicing.

• Shellfish: 145°F (63°C) in the thickest part