Peel and wash the potatoes and cook in salted water for about 20 minutes. In the meantime peel onions and cut off the lid. Hollow out onions with a ball cutter. Put onions on the fat pan of the oven. Add stock and bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 25 minutes. In the meantime, wash the tomato, dab dry and cut into quarters.
Remove seeds, dice flesh finely. Wash liver, dab dry, season with salt and pepper and turn in flour. Drain and steam the potatoes. Add milk and mash everything. Halve the purée. Mix one half with 2 tablespoons pesto. Season other half with nutmeg. Fill purees into piping bags with star-shaped spout. Pour pesto puree into the red onions, light puree into the vegetable onions. Bake onions at the same temperature for another 10 minutes. In the meantime wash apples, grate dry, cut out the core. Cut apples into slices.
Season other half with nutmeg. Fill purees into piping bags with star-shaped spout. Pour pesto puree into the red onions, light puree into the vegetable onions. Bake onions at the same temperature for another 10 minutes. In the meantime wash apples, grate dry, cut out the core. Cut apples into slices. Heat clarified butter in a pan and fry liver slices for 2-3 minutes on each side. Remove and keep warm. Briefly toss apples in the frying fat. Arrange everything together. Sprinkle vegetable onions with diced tomatoes. Garnish with marjoram and add the remaining puree and pesto.
Heat clarified butter in a pan and fry liver slices for 2-3 minutes on each side. Remove and keep warm. Briefly toss apples in the frying fat. Arrange everything together. Sprinkle vegetable onions with diced tomatoes. Garnish with marjoram and add the remaining puree and pesto.