Warm the milk and fat. Cut the rolls into small pieces. Add milk-fat mixture and 1 egg to the rolls and knead. Wash the coriander, dab dry, chop finely and fold into the bread dough.
Season with salt and pepper. Form the dough into a roll of about 20 cm. Wrap the dough roll in a tea towel and tie the ends together. Bring plenty of salted water to the boil in an elongated roaster.
Place a roll of dough in the pan and cook over a low heat for 30-35 minutes. Remove the dumpling and let it rest for a while. Remove the cloth. Cut roll into 8 thick slices. Beat the rest of the egg.
Turn the slices of bread dumpling in egg and sesame. In the meantime clean, wash and chop the spring onions. Rub the mushrooms with kitchen paper and possibly halve them. Wash the chillies and cut into fine rings.
Heat 3 tablespoons of oil in a frying pan. Sauté the mushrooms in it. Add spring onions and chilli and fry briefly. Deglaze with stock and soy sauce. Stir ketchup and starch until smooth and stir into the sauce, bring to the boil.
Season to taste with salt and coriander. Keep mushrooms warm. Heat the remaining oil in a pan. Fry the bread dumpling slices in it until golden brown. Serve the mushroom pan with the bread dumpling slices together. Garnish with chilli and coriander.