Hot Brown Sandwich(Originally Served At The Brown Hotel In Louisville, Kentucky) - cooking recipe

Ingredients

1/3 c. butter or margarine
1/2 medium size sliced onion, minced
1/3 c. flour
3 c. hot milk
1 tsp. salt
dash of red pepper
sprigs of parsley (optional)
dash of nutmeg

Preparation

Melt the butter or margarine in a saucepan.
Add onion and cook slowly until light brown, about 15 to 20 minutes.
Add flour and blend until the flour makes a smooth paste with the onion minces in it.
Add milk and other seasonings and cook, stirring constantly and briskly, until the sauce is thick and smooth. Then continue to cook, stirring occasionally, about 25 minutes altogether.
Strain.
If the sauce isn't to be used immediately, stir occasionally to keep a crust from forming on the top.