How to make
Heat the butter in a deep pan, then add the soya sauce. In the meantime, cut the pork into small pieces, the onion into very small pieces, and pre-bake the potatoes with spices to your liking, then cut them as well.
Put the pork to stew in the hot butter and when it is almost ready, add the chopped onion, while stirring and not allowing it to burn. Once the onions become tender, add grated cheese, potatoes, then the tomato puree and mustard. Mix well until ready.