Mix ingredients in a bowl. Refrigerate until ready to use.
Use unsalted butter for this recipe. If you only have salted, then reduce the amount of added salt.
Soften your butter before making this recipe. Ideally you should take it out of the fridge 30 minutes before using it. If you are in a pinch, you can gently heat it in the microwave but take care not to melt it.
If not using straight away, be sure to wrap it once it has chilled.