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Preheat the oven to 375 degrees F. Grease a sheet pan with olive oil.
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Butter 4 to 6 ramekins or a casserole dish.
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Set aside.
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For the noodles: Put a pot of salted water on to boil.
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Drop in 6 to 8 lasagna noodles, taking care not to break them.
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Cook to al dente according to package directions.
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Do not overcook.
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Remove the noodles to the greased sheet pan one at a time.
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The olive oil will keep the noodles from sticking.
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If you are using ramekins or molds, cut the cooked noodles to a size that will fit with a circle cutter.
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If you are using a casserole dish, you can cut the noodles to the correct size with a knife or kitchen shears.
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For the sauce: Put the milk in a saucepan over medium heat and bring just before boiling.
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Remove from the heat.
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In a large skillet or saucepan, sweat the onions in 3 tablespoons of the butter.
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Do not allow to brown.
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Add the flour to form a paste.
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Cook until a pale blonde color, 3 to 4 minutes.
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Add the scalded but cooled milk to the roux a little at a time, whisking to keep from clumping.
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Add the seafood stock, whisking it in a little at a time.
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Cook for 15 to 20 minutes over medium-low heat, stirring almost constantly and scraping the bottom to prevent scorching.
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Reduce the heat to low.
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Add the Parmesan.
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Add more seafood stock if the sauce is too thick, whisking in a little at a time.
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Remove from the heat.
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Stir in the lemon juice, thyme, salt, white pepper, nutmeg, canned white tuna and peas.
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For the topping: Put the breadcrumbs, 1/2 cup Parmesan, butter, parsley and salt and pepper to taste into the bowl of a food processor and pulse to combine well.
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To assemble: Layer lasagna style, alternating the noodles, sauce and tuna belly fillets, ending with a bit of the sauce on top.
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Add the topping, making sure to get the topping all the way to the edges of the container.
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Place the ramekins or casserole on a baking sheet.
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Bake until golden brown on top, about 35 minutes.
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This recipe was created by a contestant during a cooking competition.
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The Food Network Kitchens have not tested it for home use, therefore, we cannot make any representation as to the results.