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1
Prepare béchamel: melt butter over medium heat, whisk in flour to create roux, cook 2 minutes. Gradually add milk while whisking; simmer until thick and smooth (5 minutes). Season with salt and freshly grated nutmeg.
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2
Prepare ragù according to Bolognese recipe; allow to cool slightly.
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3
Spread 100 ml ragù on bottom of a 9 × 13 inch baking dish; layer 2–3 pasta sheets to cover.
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4
Alternate layers: 150 ml ragù, 150 ml béchamel, 25 g Parmigiano, pasta sheets. Repeat 3 times, ending with béchamel and remaining cheese.
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5
Dot top with 30 g butter; cover loosely with foil and bake at 180°C for 40 minutes. Uncover and bake 15 minutes until golden and bubbling at edges.
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6
Rest 10 minutes before serving to allow layers to set.