Ingredients:
• 2 tablespoons butter
• 2 tablespoons all-purpose flour
• 1 1/2 cups whole milk
• Salt and freshly ground black pepper
• Freshly grated nutmeg, to your taste
• 1/4 teaspoon cayenne pepper, 2 pinches
• 1/4 to 1/3 cup heavy cream, eyeball it

Cook the butter and flour 2 minutes over moderate heat in a preheated medium saucepan. Whisk in milk and season sauce with salt, pepper, nutmeg and cayenne. Simmer over low heat 15 minutes, stirring occasionally. Stir in cream and heat sauce through, another 5 minutes over low heat.

Turn burner to warm and stir sauce occasionally to avoid a skin forming. Whisk in a little milk if sauce thickens too much to ladle.