Wash the potatoes, cut them into quarters lengthwise and cook covered in salted water for about 15 minutes. Wash the leek, cut into large pieces and cook for about 5 minutes
Finely grate the cheese. Mix with sour cream. Season with salt, pepper and nutmeg. Cut ham into large pieces
Drain the potatoes and leek. Put them with ham in a thinly greased casserole dish. Spread the cheese mixture over it. Bake in a preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/ gas: level 3) for 10-15 minutes. Wash the chives, chop them coarsely and sprinkle over them