Put the room temperature butter into a mixing bowl and add the parsley and salt. Mix together until the parsley looks evenly distributed.
Place a sheet of parchment paper in front of you and pile the butter into the middle.
Fold the parchment paper over and roll the butter into an even log shape.
Twist both ends of the parchment and place in the freezer to set and harden.
Keep the butter in the freezer or fridge and cut off sections to use as required.
Notes
Store in the freezer wrapped in parchment and cut off sections when needed. Butter can be frozen for up to 4 months. Alternatively, store in an airtight container in the refrigerator or wrapped in parchment. The butter will keep up until the use-by date on the package of butter you used.