Put the milk and the sugar in a saucepan and bring to the boil. Mix the orange juice with the starch well. As soon as the milk boils, remove the saucepan from the heat and stir in the orange juice. Then simmer on low heat for a few minutes while stirring until the pudding has thickened. Let cool a little in the saucepan while stirring occasionally (below 80 ° C).
In the meantime, dissolve the gelatine in cold water according to the instructions on the package. Squeeze out the gelatine, dissolve it with a few tablespoons of warm pudding and slowly add to the rest of the pudding, stirring constantly.
Fill the pudding in a bowl, cover directly with cling film so that no skin forms and allow to cool completely.
Chop the chocolate into small cubes and whip the cream until stiff. Stir the pudding well, carefully fold in the chocolate pieces and cream. Keep in a cool place until serving and decorate with chocolate sprinkles as desired.