Pistachio lasagne

12 very thin sheets of pasta
12 thin slices of mortadella with pistachio
12 slices of provola
100 gr Parmesan
1 liter of béchamel
200 gr pistachio flour
20 pistachios
Make a lasagna with 4 layers of :
béchamel
mortadella
provola
Parmesan
pistachio flour
End with béchamel and pistachio flour and Parmesan.
Bake at 180° C for 50 minutes or until it is golden brown.
When you serve, decorate with some pistachios.