In a bowl, season the ground beef with pepper, garlic powder, salt and breadcrumbs.
Then pour-in the Worcestershire sauce. Mix well.
Scoop around 4 tablespoons of mixture and roll into a ball. Flatten and place in a clean plate. Set aside.
Heat butter in frying pan. Then fry the beef over low heat until brown. Remove from the pan, set aside.
In the same pan, cook mushroom and stir for 5 minutes.
Then put the flour and cook for another 5 minutes.
After 5 minutes, gradually pour the beef stock and water. Stir continuously until it boils.
Then add the cooked beef and simmer for another 10 minutes.
Serve while hot. Enjoy!