Cut the meat into small cubes. Clean the mushrooms and, depending on size, cut them in half or quarters. Peel and chop the onion. Heat the oil in a pot, fry the meat in it in two portions and remove. Fry the mushrooms and onions briefly as well, then add the meat again. Stir in tomato paste, braise well, salt and add stock. Remove the seeds from the chilli, wash and cut into fine rings.
Add to the meat and simmer covered for about 1 1/2 hours. Clean, wash and cut leek into rings. Peel and wash potatoes and cut them into thick sticks. 20-30 minutes before the end of the cooking time add potatoes and leek to the stew and cook. Drain the pumpkin and collect the stock. Cook the pumpkin cubes for the last 5 minutes. Whisk the flour in about 4 tablespoons of pumpkin stock, stir into the stew and simmer for another 2 minutes