In a large pot, boil your noodles
in salted water until al-dente. Drain and let cool.
To make your meat sauce, heat the oil in a pot. Brown the
ground beef with the garlic and onions. Add your tomatoes, bay
leaf, salt and pepper and cook on low heat for about 20
minutes.
Butter a large casserole pan, and put your noodles into it.
Add the beaten egg, and toss the noodles with it. Pat them
down into the pan. Pour your sauce over the noodle layer,
smoothing it out. Set aside.
To make the Bιchamel Sauce, you have to make what's called
a roux. Melt the butter in a pot. Add the flour and mix
constantly with a wire whisk. It will look like bubbling cake
batter (roux). Add some salt and pepper, and a dash of nutmeg
(optional). Add the milk, and remember, you have to keep
whisking constantly while cooking until the sauce thickens.
Pour it over the casserole. Sprinkle with some grated cheese.
Bake at 350°F for about 20 minutes, or until the top crust
has browned.