Ricotta Basil Lasagne

1 pound lasagna noodles
4 tablespoons butter
2 tablespoons flour — sifted
salt and white pepper
pinch nutmeg
2 cups milk — warmed
1 1/2 tablespoons fresh basil — finely chopped
1/2 cup ricotta cheese
1/2 cup Parmesan cheese — grated
1 1/2 tablespoons fresh basil — chopped

Preheat oven to 400 degrees F.
Cook the lasagne sheets in boiling salted water, a few at a time, until al dente.
Remove carefully and drain between dish towels.
Melt butter in a saucepan and stir in flour.
Add a little salt, pepper and nutmeg and cook over a gentle heat until flour begins to change color.
Slowly whisk in warm milk until sauce is smooth and thickened.
Remove from heat and stir in 1 tablespoon basil, the ricotta and half the Parmesan.
Check seasonings.
In a greased baking dish, or lasagne pan, place a sheet of pasta, followed by a thin layer of ricotta mixture.
Sprinkle this with some Parmesan and extra basil.
Continue to layer in this order, finishing with the last of the sauce and Parmesan.
Bake for just 20 minutes and serve hot.