Mix jelly powder and sugar. Mix with 300 ml water with a wooden spoon in a saucepan. Heat while stirring until everything is dissolved (do not bring to the boil). Let the jelly cool down a little. Rinse a flat dish or a suitable bowl with cold water and cover with foil.
Add the jelly and chill. Heat the milk in a saucepan lukewarm. Chop the chocolate and melt over a warm water bath. Add milk while stirring constantly and let it cool down. Whip cream until stiff and fold into the still liquid chocolate. Pour mousse into a piping bag, cut off a larger corner and squirt into 4 matching glasses. Cover the mousse and leave to cool for 3-4 hours. Turn the jelly out of the mould onto a board. Remove the foil. Cut the jelly into cubes with a moistened knife.
Pour mousse into a piping bag, cut off a larger corner and squirt into 4 matching glasses. Cover the mousse and leave to cool for 3-4 hours. Turn the jelly out of the mould onto a board. Remove the foil. Cut the jelly into cubes with a moistened knife. Arrange some cubes on the mousse and sprinkle with brittle. Serve with the remaining diced jelly
waiting time 3-4 hours