Place tarragon and softened butter into a bowl and stir until evenly combined (optional add a sprinkle of salt)
Lay a piece of plastic wrap onto a counter. The plastic wrap should be at least 8” long and 4” wide. This is what will be used to create the compound butter log
Place the compound butter into a log shape in the center of the plastic wrap. Pull up on of the long sides of the plastic wrap and form a log similar to how you would form a roll of shortbread cookies
Wrap the log tightly by rolling longwise. Once a secure log is formed, twist the ends of the plastic wrap butter similar to the ends of a tootsie roll
Place the log in to fridge until hardened and slice into round pieces to serve