Beef with onion

3 lbs corned beef brisket , cubed 4 tablespoons olive oil 2 quarts beef broth salt & freshly ground black pepper, to taste 1 teaspoon dried oregano 1 teaspoon[...]

2 pounds of stewing beef , cut into 3/4-inch cubes 1 stick of butter 2 onions , peeled and coarsely chopped 2 pounds of potatoes , peeled and chopped into 3/4[...]