Wash potatoes thoroughly and boil in water for 25-30 minutes
Wash, dry and dice the meat. Clean, wash and finely chop the mushrooms and spring onions. Drain mandarins. Halve bacon crosswise
Skip the bacon and take it out. Heat the oil in the bacon fat. Sauté meat and mushrooms in it, turning, season. Sauté spring onions briefly. Sprinkle with flour and sauté. Deglaze with 300 ml water and cream. Bring to the boil and stir in stock. If necessary, thicken additionally with a little sauce thickener. Add mandarins and chives and season to taste
Cut the potatoes in half and place them in a flat roasting pan or on a baking tray. Spread the ragout on top. Grate cheese over it. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 10-15 minutes. Garnish with bacon