Step 1

Use a double boiler with simmering water or set a medium-sized heat-proof bowl over a small saucepan filled with simmering water.

Step 2

Place the butter in the double boiler or bowl and heat it until it is mostly melted. Then, remove from the heat and whisk the butter until it becomes smooth and just melted.

Step 3

Whisk the melted butter while slowly streaming in the milk. Keep whisking until the mixture is smooth for about 2 to 3 minutes. If the mixture separates, place the bowl back on the double boiler and whisk,

Step 4

Allow the mixture to cool or come to room temperature before using.