Melt your butter in a small saucepan over medium-high heat. When the butter just starts to boil, reduce the heat to medium and simmer until it's foamy (make sure to stir pretty frequently).

Continue to cook, while you stir and scrape the bottom of the pan, until the foam subsides and the butter has turned a deep golden color (there will be little specks of brown in there, too).

This process takes about 5 minutes for me, but it will depend on your stove and type of butter. You really have to keep your eye on it so it doesn't burn (which is not pleasant).

Immediately remove from the heat and pour into a heatproof bowl.