Melt butter, do not brown.
For this step
Butter 100 g
Whisk in flour all at once and cook 2–3 minutes without browning.
For this step
Butter 100 g
All-purpose flour 100 g
Pour in warm milk and whisk until smooth.
For this step
Whole milk 1 l
Bring to a boil, then simmer 8–10 minutes until thick and coats a spoon.
Season with salt, white pepper, and nutmeg.
For this step
Salt
White pepper
Nutmeg