• 2 white onions, chopped finely
• 4 tablespoons butter (two for cooking the onion, and two to make the roux)
• 2 tablespoons flour
• 1 cup milk
• salt and pepper
• 3 tablespoons heavy cream

In a saucepan, melt the other 2 tablespoons of butter and incorporate the flour, stirring over low heat for two minutes.

Gradually whisk in the milk, blending well after each addition. Cook the sauce over low to medium heat until it thickens and comes just to a boil. Remove from heat and stir in the cooked onions and heavy cream.

Makes about 1 1/3 cups sauce.