Peel, wash and slice the kohlrabis. Heat herb butter in a pot. Sauté the kohlrabi in it. Add 100 ml water, season with some salt, bring to the boil and cook for about 10 minutes.
Boil 750 ml water, add 1 teaspoon of salt. Remove from heat, add milk. Stir in the purée flakes. Wash parsley, shake dry and chop. Add cream to the kohlrabi, bring to the boil, stir in parsley and ham.
Arrange mashed potatoes and kohlrabi on plates.