Beef with mustard

2 lbs sirloin steaks, cut into thin strips 1 pint fresh mushrooms , sliced (about 2 cups) 2 medium onions , thin sliced 2 tablespoons oil 2 teaspoons beef[...]

1 lb ground beef 1 onion , chopped 1 cup chopped celery 2 garlic cloves , minced 2 tablespoons flour 28 ounces beef broth 2 potatoes , scrubbed and chopped 14[...]