Wash the asparagus, peel and cut off the woody ends. Wash potatoes and cook in salted water for about 15 minutes. Cook the asparagus in slightly simmering salted water for about 10 minutes
For the sauce, wash herbs, shake dry, pluck off leaves and chop. Mix sour cream, milk, lemon juice and mustard. Add the herbs, except for 2 tbsp., to the sour cream mixture and puree with a hand blender to create a green sauce. Season to taste with salt and pepper. Stir in remaining chopped herbs
Wash parsley, shake dry, pluck off leaves and chop finely. Drain the potatoes, lift the asparagus out of the water. Arrange both on a serving dish with the ham. Pour some sauce over the asparagus. Add the rest of the sauce. Sprinkle parsley over the sauce