Peel the onion and cut into strips. Peel carrots and celery. Cut carrots into thick slices and dice celery. Wash the meat and cut into large cubes (approx. 3 x 3 cm). Heat the oil in a roasting pan and fry the meat in 2 portions for about 5 minutes each.
Remove the meat and fry the vegetables in the frying fat for about 5 minutes. Put meat back into the roaster, dust with flour, sweat briefly and add stock while stirring. Season with Worcestershire sauce and pepper
Peel and wash the potatoes and cut or slice them very thinly. Spread the potatoes like roof tiles on the goulash and add butter in flakes
Cook in a closed roaster in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see manufacturer) for approx. 2 hours. Remove the lid and bake for another 45 minutes