Wash the marjoram, shake dry and, except for something to garnish, pluck off the leaves. Mix liver sausage and 4 tablespoons of cream. Stir half of the marjoram into the liver sausage. Season with pepper.
Dab the meat dry and season with salt and pepper. Spread liver sausage on the meat, roll it up and pin it. Clean, wash and cut leek into rings. Heat oil in a pan. Fry pork rolls in it for about 10 minutes at medium heat.
Turn it over once in a while. Melt the fat in a pot and sauté the leek in it. Dust with flour. Add stock and remaining cream, bring to the boil and cook for about 5 minutes. Add remaining marjoram leaves to the leek.
Season to taste with salt, pepper and lemon juice. Arrange leek vegetables and pork rolls on plates. Garnish with marjoram and lemon wedges.