Corned Beef with potatoes

2 tablespoons vegetable oil 1/2 cup red onion , thinly sliced 1 1/2 lbs deli corned beef , coarsely chopped 1 (26 ounce) bag hash browns 2 tablespoons steak[...]

1 medium onion , chopped 2 tablespoons butter or 2 tablespoons margarine 2 tablespoons all-purpose flour 1 1/2 teaspoons salt 1 teaspoon Worcestershire sauce[...]