- 1/2 cup all-purpose flour, or as needed
- 1 (3 pound) beef chuck steak, cut into 1 1/2-inch cubes
- 3 onions, thinly sliced
- 3/4 cup water
- 3/4 cup ketchup
- 1/4 cup soy sauce
- 2 tablespoons vinegar
- 1 1/2 tablespoons Worcestershire sauce
- 1/2 pinch white sugar
- Preheat oven to 250 degrees F (120 degrees C).
- Put flour into a large, sealable plastic bag; add beef cubes and seal bag. Shake bag to coat beef in flour; transfer beef to a large casserole dish.
- Top beef with sliced onions.
- Whisk water, ketchup, soy sauce, vinegar, Worcestershire sauce, and sugar together in a bowl; pour over the onion slices. Cover the dish with aluminum foil.
- Bake in preheated oven until the beef is tender enough to pull apart with a fork, about 3 hours.