Nut cake with peach cream, every piece melts in your mouth

Bring the milk, canned peach juice, sugar and pudding powder to the boil to form a thick pudding. Let it simmer briefly and then place the pot in cold water. Allow the pudding to cool while stirring constantly. Mix soft butter with powdered sugar and rum to a white foam. Add the cold pudding in portions and stir the whole thing into a smooth cream