Wash the potatoes and boil in water for about 20 minutes. Wash the asparagus, cook in 1/4 l lightly salted water for about 20 minutes
In the meantime chop the onion finely. Wash the mushrooms and cut into thin slices. Cut ham into fine strips
Heat the fat. Sauté the onion in it. Add mushrooms and fry for 3-5 minutes. Season with salt and pepper. Add 200 ml of the asparagus stock, bring to the boil and thicken. Refine with sour cream and heat up ham in it. Season to taste
Wash parsley, shake dry and chop finely. Drain the potatoes and peel them. Lift out the asparagus. Arrange asparagus with potatoes, sauce and parsley