Wash potatoes well and cook covered for about 20 minutes.
Clean and wash the cauliflower and divide it into florets. Clean, wash and cut the beans into pieces. Peel, wash and slice carrots.
Cook the cauliflower, carrots and beans in approx. 3⁄4 l of boiling salted water covered for approx. 12 minutes. Add peas and cook for about 5 minutes. Drain the vegetables, collect the cooking water and measure approx. 400 ml.
Heat 2 tablespoons of butter. Lightly sweat flour in it. Stir in vegetable water and milk. Bring to the boil and simmer for about 5 minutes. Season to taste with salt, pepper and nutmeg. Heat vegetables in it. Wash, chop and sprinkle parsley.
Drain the potatoes, rinse and peel them as desired. Swivel in 1 tablespoon butter and season with salt. Add ham.