Break the chocolate and mint bar into pieces. Heat the cream while stirring. Melt the chocolate and mint bar in it while stirring. Let the truffle mixture cool down a bit first, then put it in a cool place for 2-3 hours. Press the aluminium cups a little bit apart. Mix the truffle mixture with the whisk of the hand mixer until creamy.
Pour into a piping bag with a large star-shaped spout and squirt the truffle mixture into the moulds. It is best to keep it cold overnight. Decorate with chocolate hearts. Store truffles in a cool place. Results in about 55 pieces