Clean, wash and chop the leek. Peel, wash and thinly slice the carrots. Cook vegetables in boiling salted water for 5-7 minutes. Drain, collecting 150 ml of boiling water.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Fry the potato noodles in 1 tbsp. hot butter for approx. 4 minutes, remove. Brown the diced ham in the frying fat. Stir in sour cream and cooking water.
Season with salt, pepper and nutmeg. Grease four small or one large casserole dish. Add potato noodles, vegetables and sauce. Sprinkle with cheese. Bake in a hot oven for about 5 minutes.