Peel and dice the sweet potato and cook until soft.
Put the vegetable stock and milk in a saucepan and bring to the boil. Add the polenta and simmer for 15 minutes on a low heat with the lid closed, until it is no longer too grainy. Add water if necessary.
Dice Scarmorza so that you get about a handful. (The remaining cheese can then be eaten cold, for example, as a topping with the warm porridge.)
Puree the soft-boiled sweet potato and add to the polenta along with the handful of scarmorza. Stir vigorously until the scarmorza has melted and a creamy polenta has formed.
The polenta can be served with braised mushroom vegetables as shown in the pictures or as an accompaniment to meat.