In a pan mix in butter and the bechamel mix/Flour mix it for 2 min, then add the milk stir repeatedly for 20 min, add the mozzarella and parmesan, stir then add a pinch of nutmeg when thick enough add in the fresh chopped parsley.
For the beef/chicken mix
In a hot pan with oil Fry the chicken/beef minced till slightly brown, add the garlic and onion, then sautee with salt, pepper, oregano and basil
Add in the the Tomato sauce, Tomato paste, sugar and ketchup and let it simmer for a min.
The lasagna
Place beef/chicken mix in the bottom of the baking pan add a layer of pasta on top, add in the béchamel sauce sprinkle with cheese and then add in the beef/Chicken mix add a layer of lasagna pasta and repeat, put a layer of Mozzarella and Parmesan at the very top
Preheat the oven to 175', cover dish in aluminum foil and bake for 30 min, remove after and bake in for 10 min more