in a pot with low temperature add the butter and let it melt slowly
add the milk and then warm that up, not to a simmering point
when the pot is warm to the touch, start adding flour
spoon by spoon sprinkle it over the top and then, simply stir that in
continue till all the flour is gone
add the nutmeg
add the sea salt
add the black pepper
continue cooking until you have a nice thick bechamel sauce
if it doesn't work and it stays thin, you can always add extra flour to come to the consistency you like
in an oven pot, spread a little bit of oil, just so it doesn't stick to the bottom and the sides
add a thin layer of ragu bolognese and on top the lasagna plates
cover the lasagna again with meat sauce
add a good sprinkle of freshly grated parmesan
add a couple of dollops of bechamel, when cooking it will spread nicely
add one more layer of lasagna plates
add more meat sauce
add a good sprinkle of freshly grated parmesan
add a couple of dollops of bechame
continue till you reach up ⅔ of the oven pot
add the remaining bechamel on top
cover it up, place it in the oven, middle rack, at 180℃-356℉ for 30 - 40 minutes
once ready let it rest to cool down to a good eating temperature
ready to serve