Soak the dried goji berries in apple juice or orange juice for at least 60 minutes, then drain well in a sieve.
Heat 1 tablespoon of butter in a saucepan and sauté the rice until translucent without it taking on color. Deglaze with milk.
Add granulated sugar, vanilla sugar and cinnamon and simmer gently over low heat for about 20 minutes, stirring frequently.
After about 20 minutes, remove the saucepan from the heat, fold in the chopped chocolate and goji berries and divide the creamy rice pudding into bowls.