Bulba s gribami (potatoes with mushrooms)

Instructions

1. Peel the potatoes and cut them into large, even cubes. Thinly slice the onions and cut the mushrooms.
2. Heat the oil and butter in a large frying pan and brown the potatoes for 10 minutes over medium-high heat, turning them.
3. Add the onions and mushrooms, season with salt and pepper, then lower the heat.
4. Cover and cook for 20 minutes, stirring now and then, until the potatoes are tender.
5. Uncover, turn the heat up for 3 minutes to get good colour, then stir in the chopped parsley.
6. Serve piping hot, with crème fraîche if you like.