Clean and wash the leek and cut into fine rings. Heat 1 tsp. oil in a frying pan. Fry the diced ham for 3-4 minutes until crispy. Add the leek, steam for 1-2 minutes and then pour into a bowl.
Stir in breadcrumbs and sour cream well. Season with salt and pepper.
Dab the meat dry and cut into the meat with a sharp knife 3-4 cm deep lengthwise, but do not cut through completely. Open the fillet and fill in the leek mixture. Fold up again and wrap with kitchen string.
Season with salt and pepper.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Heat 1 tablespoon of oil in a pan. Brown the meat thoroughly on all sides and place on a baking tray. Fry in a hot oven for approx. 15 minutes.
Deglaze the frying pan with wine, dissolve and bring to the boil. Add cream, bring to the boil and simmer for about 10 minutes. Season to taste with salt and pepper.
In the meantime, heat 1 tablespoon of oil and butter in portions in a large frying pan. Fry the potato noodles for 5-6 minutes while turning. Season with salt and pepper. Keep ready potato noodles warm.
Dress everything.