Peel, wash and quarter the rutabaga and cut into cubes (approx. 1.5 cm). Peel and wash the potatoes and cut them into quarters or halves, depending on their size. Drain beetroot and cut into six.
Mix rutabagas, potatoes, beetroot, salt, pepper, sugar and oil well. Spread evenly on a fat pan and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 45-50 minutes.
Coarsely crumble the ground pork. Spread on the vegetables 20 minutes before the end of the baking time. In the meantime mix curd and milk. Take the vegetables out of the oven and arrange on a plate. Add the quark. Garnish with marjoram.