Preheat oven to 350 Fahrenheit
To make roux, melt butter in pan and add flour. Cook stirring constantly for a minute to cook flour. Add milk, very gradually at first, a little quicker about halfway through milk use, stirring after each addition to combine. Add salt and pepper to taste.
Parboil noodles in salted water until al dente or just under - depending on width or size of dish, around 10 to 15. Drain.
See below to assemble, starting with meat sauce on the bottom of the oven proof lasagna dish and ending with cheese on top.
meat sauce (1 1/2 cup) BOTTOM
noodles (2-3)
white sauce (under 1/3)
cheese (1 cup)
noodles (2-3)
meat sauce ( 1 1/2 cup)
noodles (2-3)
white sauce (under 1/3)
cheese (1 cup)
noodles (2-3)
meat sauce (2 cups)
noodles (2-3)
white sauce (over 1/3)
cheese (2 cups) TOP
Cover and cook until the cheese is melted and bubbling and the center is hot - 30 or so minutes. Remove lid and bake for another 10 minutes.