From: The Thorough Good Cook

Sauces: 8. Bechemel.

Put six ounces of flour in a basin; moisten with half a pint of cold milk; pour into a stew-pan, stir it on the fire; as soon as the mixture becomes a smooth paste, take it off the fire and work it well with a spoon. Then add three-quarters of a pint of boiled milk, two small onions, a bunch of parsley, salt, peppercorns, and four ounces of raw ham in small dice; bring it to the boil; put it back on a very slow fire, and cook it for twenty minutes, stirring carefully from time to time ; pass all through a tammy.

If you think the sauce too rich for macaroni, you can serve with the gravy of roast meat, thickened with a little flour, and rendered more relishable with a little burnt onion.