Make a simple chocolate ganache by melting the chocolate in hot cream. Bring the cream just to the boil and pour it over the chocolate pieces. Mix until chocolate has melted, then stir in Frangelico. Set aside at room temperature, covered, and allow to cool completely and set (approximately1 to1 1/2 hours). Use a teaspoon to spoon out bite-sized pieces. Dust your hands with a little icing sugar to prevent them sticking and roll mixture into balls in the palm of your hands. Roll in the sifted cocoa.