How to Make Black Butter

How to Make Black Butter. Black butter (OK, it's really dark brown) can make a nutty sauce, typically used on fish. This will make enough for two to three fish portions.

Heat butter in a heavy saucepan over medium heat until it is dark brown, with a nutty aroma. Swirl the pan occasionally so that the butter doesn't burn. (You don't want it actually black.)

Add vinegar and blend. Be careful, because the vinegar will cause the butter to hiss.