Put chopped chocolate in a large heat proof bowl & keep aside.
In a saucepan, heat cream & butter on medium heat. As soon as it starts to boil, remove from flame & pour over chopped chocolate. Allow it to stand without mixing for few mins (about 3-4 mins). Do not stir as we do not want to incorporate air in Ganache.
Using a wooden spoon/ rubber spatula or whisk, gently stir by beginning in the center & gently moving out to the edge of the bowl. When the chocolate is fully melted & mixture is smooth, add any liqueur or liquid flavourings (all should be at room temp.)
Allow it to cool down completely & set properly. Before storing, cover with a piece of plastic wrap pressed on the top of the ganache so a film doesn’t form.It can be stored at room temp in a cool corner for 2 days & freeze upto 3 months.