Bechamel Sauce

Directions

1. 1
   Melt the butter in a heavy saucepan, blend in the flour with a wooden spoon, and cook over moderate heat, stirring, until butter and flour foam together for 2 minutes without turning more than a buttery yellow color.
2. 2
   Remove from heat, and when bubbling stops, vigorously whisk in all the hot milk at once.
3. 3
   Bring to the boil, whisking.
4. 4
   Simmer, stirring, for 2 minutes.
5. 5
   Season to taste.