Melt the butter over a low heat in a small saucepan or over a bain-marie.
Remove the white foam that rises to the surface with a skimmer. The amount of foam depends on the quality of the butter.
Put the butter to one side and keep it lukewarm. This will keep the milk solid at the bottom and the clear clarified butter on top of your saucepan. You can also place it overnight in the fridge.
When pouring the clear butterfat into your jar, make sure not to pour the milk solids as well. Use a mesh sieve or a filter if you don’t feel confident.
If you have placed the butter in the fridge, you scrape the whey off the clarified butter.