01 -
Heat the milk on a low flame in a small pan, keeping it from boiling.
02 -
Using a medium pan, melt the butter at medium heat. Start whisking in the flour right away to get a lump-free paste. Let it cook for a minute or two, but don’t let it change color.
03 -
Pour the milk into the butter-flour mixture a bit at a time, whisking constantly to keep it smooth. Stick with medium-low heat and stir regularly until the sauce thickens up. It’ll take around 5 to 7 minutes.
04 -
Mix in the salt, white pepper, and nutmeg if you're using it. Adjust the seasoning to suit your taste before serving.