If desired, add the liqueur. Truffles are just small balls of chocolate that can be rolled into cocoa powder, powdered sugar or toasted chopped nuts. You can use your hands to form the truffles, or else use a melon baller or small spoon. Make sure the chocolate ganache is very firm before forming into balls. Truffles can be refrigerated for a couple of weeks or else frozen for a couple of months.
Truffles are a lovely addition to a cookie platter.