Bring the milk in a saucepan to the boil briefly. Add rice pudding, cook over low heat for about 35 minutes, stirring several times. Spread rice on a baking tray and let it cool down for 20-30 minutes
Wash the orange hot, grate dry and grate the peel thinly. Separate the egg. Beat egg white and salt until stiff. Whisk egg yolk, sugar and half of the orange peel, stir into the rice pudding. Fold in the beaten egg white. Cut chocolate into pieces and stir carefully into the rice pudding.
Coarsely chop the hazelnuts and mix with brown sugar. Grease an ovenproof dish (750 ml content). Pour in rice pudding, sprinkle with hazelnut-sugar mixture and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 5-6 minutes. Remove, with the remaining orange peel b