In a heavy pot combine the milk, carrot, celery, onion, peppercorns, clove and bay leaf. Heat until bubbles form around edge of pot.
Set aside for 5 minutes and strain. Over moderate heat, melt the butter in the saucepan.
Add the flour and stir until flour and butter are blended.
Cook over moderate heat for 1 minute, stirring constantly. Add the strained milk in a slow steady stream as you stir constantly with a whisk.
Switch to a wooden spoon and continue to stir as the mixture comes up to a simmer. Turn heat down and simmer for 5 to 10 minutes, stirring occasionally, until the sauce becomes smooth and thick.
Season to taste with nutmeg ans salt and pepper.
Yields: 1 1/2 cups