Fry the goulash in the hot oil. Cut the onions and peppers into fine strips, add and fry them. Add the tomato paste, dust the paprika powder over it and sauté briefly. Pour in the stock and malt beer, bring to the boil and cover and simmer over a medium heat for about 1.5 hours.
Stir in the cornstarch and cook for 1 minute. Season to taste with salt, pepper, paprika and sugar.