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1
Preheat oven to 350.
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2
Butter a shallow 2-quart casserole with 1 tablespoon butter.
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3
Combine shrimp and crab in a large mixing bowl, and toss well.
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4
Heat a large pot of salted water to boiling and cook the noodles according to the package directions, until just tender.
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5
Drain and set aside.
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6
Melt remaining 3 tablespoons butter in a large skillet, add onion and mushrooms and cook, stirring until softened, about 5 minutes.
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7
Add onion mixture and lemon juice to the seafood.
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8
Season with salt and pepper and toss again.
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9
Combine eggs, half-and-half, and Parmesan in another large bowl and stir until well blended.
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10
Add about two-thirds of the egg mixture to the seafood mixture and stir again to mix well.
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11
Spread about a third of the seafood mixture over the bottom of the prepared casserole.
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12
Cover with 2 of the noodles, then spread another third of the mixture over the noodles, cover with 2 more noodles, and spread the remaining mixture over the top.
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13
Cover with the last 2 noodles, pour the remaining egg mixture over the noodles and sprinkle the mozzarella evenly over the top.
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14
Bake on the center oven rack until bubbly and golden, about 35 minutes.
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15
Let stand 10 minutes before serving.
