Heat the fat in a pan on medium heat and fry the potato cubes on all sides. Add the onion and leek, stir-fry. Pour in the vegetable stock, reduce the heat to the second lowest level and put the lid on.
After 10 minutes add the spring onions and cook for about 5 minutes. Season with salt, pepper, paprika and nutmeg, sprinkle with parsley, turn off the heat, but leave the pan on the stove with the lid closed.
Place minute steaks between two cling film and plate.
Season each steak with a little salt and pepper and brush with 1 teaspoon pesto, place 10 g blue cheese in the middle of the steak, then roll up from the narrower to the wider end.
Close with a wooden stick.
Heat the fat in a second pan on medium heat and brown the steak rolls on all sides.
Arrange the leek potatoes with the steak rolls on plates.
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