To prepare the butter, add all of the ingredients to a food mixer with a paddle attachment and mix well for 1-2 minutes until all of the ingredients are incorporated.
Turn out onto a sheet of cling film and spread out to make a 1/2cm thick layer wrap tightly into a block of cling film.
To assemble the cocktail, cut a 3cm square or small cylinder of the whisky butter and add to a mug.
Pour in 50ml of whisky, then top up with hot water and stir to incorporate