Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      stick         unsalted butter
   1      cup           all-purpose flour
   4      cups          hot milk
     1/2  teaspoon      freshly grated nutmeg

Preparation:

Melt butter in a 2-quart saucepan until frothing. Remove from heat and stir in flour with a whisk. Cook over low heat for 4 to 5 minutes, stirring constantly. Add 1/2 hot milk an whisk until smooth. Add remaining milk and whisk until smooth. Bring to boil, add nutmeg, lower heat and simmer 10 minutes. Can be used hot or cold.