Put the butter in a bowl, set aside
On a cutting board, place the garlic on it and put the dash of salt on top of the garlic. With your knife, use the salt as an abrasive to grind the garlic into a paste. Once paste like(can still have a few chunks) place that in the bowl with the butter.
Add the rest of the ingredients. And mix well.
Take a spatula and place the butter onto a sheet of plastic wrap. Almost in a meatloaf shape. Wrap the butter in plastic and mold it into a log. (like a big link of sausage). Place it in fridge to harden for at least a few hours. I recommend making this a day before you use it because the flavors meld together better. Once hardened, use it like you would any butter.