Vegetable dumplings with mushroom ragout

Ingredients for 4 people: 200 g bread rolls (from the day before)2 onions125 g carrot100 g beetroot1 tbsp butter200 ml milk (3.5%)400 g pink mushrooms1-2 tbsp oilsalt, pepper400 ml vegetable stock100 g whipped cream1-2 tbsp light sauce thickener1 egg (…