Bring the cream to a boil. Pour 1/3 of the cream over the chopped chocolate.
With a spatula, mix rapidly to obtain a smooth and glossy texture. Gradually add the remaining cream, making sure to keep the smooth and glossy emulsion.
Mix until the chocolate is completely emulsified.
Stir in softened butter and mix thoroughly. Then add the Bourbon and stir.
Leave the ganache chill until set for about 12hs.
Assembly
Put teh ganache in a piping bag.
Pipe small balls on the greaseproof paper. Roll ball between your hands to make a regular shape.