In a separate saucepan, melt the butter over medium heat.
Add the flour and stir continuously to form a roux.
Gradually whisk in the milk, ensuring there are no lumps.
Season with salt and dried ground nutmeg to taste.
Cook, stirring constantly, until the sauce thickens.
Assemble the Lasagna:
Preheat your oven to 180°C (355°F).
In a baking dish, spread a thin layer of meat sauce on the bottom.
Place a layer of lasagne sheets over the meat sauce.
Add another layer of meat sauce, followed by a layer of béchamel sauce.
Sprinkle a portion of the grated mozzarella cheese over the béchamel.
Repeat the layers until all ingredients are used, ending with a layer of béchamel sauce topped with the remaining mozzarella cheese.
Bake:

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