Wash the potatoes, bring to the boil covered with water and cook for 25-30 minutes. Peel and wash carrots and cut them into small cubes. Peel, wash and finely dice the celery. Clean, wash and cut spring onions into rings. Heat oil in a pan.
Fry the minced meat for about 5 minutes. Add carrots, celery, spring onions and tomatoes. Season with salt, pepper and marjoram. Bring everything to the boil and cook for about 10 minutes. Mix ricotta and egg, season with salt and pepper. Drain the potatoes, peel and cut in half. Put the potato halves into a greased casserole dish. Spread the minced meat mixture on top. Add one tablespoon of ricotta cheese each. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 10 minutes.
Drain the potatoes, peel and cut in half. Put the potato halves into a greased casserole dish. Spread the minced meat mixture on top. Add one tablespoon of ricotta cheese each. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 10 minutes. Wash and chop the parsley and sprinkle over the potatoes before serving. Serve with green salad with red onions