This recipe uses oven-ready lasagne noodles, which do not require any precooking before baking. It's up to you to decide whether or not you should skip this painstaking step: you may use them "as is" directly in the baking dish, or you may precook them anyway to obtain soft noodles which can be cut up easily to better fit the baking dish. Other advantages of precooking are that the noodles will absorb the sauce better, and the final baking will be faster.
Make the béchamel
Heat the butter in a heavy saucepan over moderately low heat until it has melted, then add the flour and cook the roux over low heat, with whisking, for 3 minutes. Add the milk in a fast stream while whisking vigorously to avoid lumps. Bring to a boil, then reduce the heat and simmer, whisking occasionally, 6-7 minutes. Season with salt and
pepper. Add all the grated Parmesan minus about 3 spoonfuls (set this aside for sprinkling on top of the assembled lasagna dish). Stir in the grated nutmeg.
If desired, you may precook the lasagne noodles. Working in batches, plunge 3-4 noodles at a time in a large pot of boiling salted water. Add one spoonful of olive oil to the water to prevent the noodles from sticking to each other. Do not cook the noodles through, but just until a bit soft, about 2-3 min, then drain them, pat dry and place them in one layer on a kitchen towel.
Spread a few spoonfuls of béchamel sauce on the bottom of a baking dish. Arrange some lasagne noodles over the sauce, without overlapping them (allow room for swelling during cooking), until the bottom of the dish is covered. Spread some spoonfuls of béchamel and meat sauce over the noodles, then cover with another layer of noodles. Repeat the layering of sauce and noodles 4 to 6 times, depending on the serving size and the shape of the baking dish. Top the lasagna with the reserved Parmesan.
Preheat the oven to 205ºC/400ºF. Bake the lasagna, uncovered, until the top is golden-brown and the sauce is bubbling, about 30-35 min (or a 20-25 min if the noodles have been precooked). Let stand 5 to 10 minutes at room temperature before cutting and serving.
Béchamel and bolognese sauces can be made 2 days ahead, then chilled or frozen separately. Bring the sauces to room temperature before using.
The complete dish may be assembled 2 days ahead and chilled or frozen, well covered. It can be taken directly from the freezer and baked for about 1 h.
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