Wash the leek. Cut onion and leek into rings. Cut ham into cubes
Heat the oil. Fry the onion rings in it until golden brown, take them out. Fry the leek and ham in the frying oil, turning occasionally. Deglaze with a good 100 ml water. Bring to the boil and stir in the stock. Covered
Let simmer for about 5 minutes. Bind and stir in cream. Season to taste with salt and pepper
Bring 6 tablespoons (60 ml) of water to the boil. Add milk. Stir in mashed potatoes. Stir again after about 1 minute. Season to taste with salt and nutmeg
Arrange leek vegetables and mashed potatoes. Spread onion rings on the puree. Garnish with parsley if desired.