Preheat oven to 180°C/350°F. A standard sized baking dish is ideal to use, at approx. 23x33cm (9x11inch).
To make the first layer, coat the base of the baking dish with a thin layer of bolognese. Then, lay a single layer of lasagne sheets, breaking up sheets to fill in the gaps. Now, coat the lasagne sheets with a thin layer of the bechamel sauce.
To make the second layer, scoop (and spread evenly) about ⅓ of the remaining bolognese sauce into the baking dish. Lay the second layer of lasagne sheets, topped with a thin layer of the bechamel sauce.
Repeat 2 more times.
After the 4th layer of lasagne sheets have been laid, pour all remaining bechamel sauce (there should be about half left) on top of the sheets, forming that top thick layer.
Sprinkle parmesan cheese all over the bechamel sauce.
Bake for 40 minutes on the middle shelf of the oven or until cheese blisters and turns golden.
Allow lasagna to rest for at least 20 minutes before cutting and serving for the perfect layers!