Spatula 1/2 the mix onto a piece of waxed paper in a row - roll into a tight log.
Wrap with foil and freeze.
Slice off pieces when ready to use!
You can make variations of this butter by changing the ingredients. Here are some of the things I've tried: finely chopped sun-dried tomatoes, chopped chives, chopped mushrooms, white wine, softened chopped shallots, bacon, blue cheese (great on steaks).