Easy Beef with tomatoes

2 cups chopped onions 2 garlic cloves , minced 2 tablespoons butter or 2 tablespoons margarine 2 lbs boneless round steak , trimmed of fat and cubed reserved[...]

2 1/2 lbs beef chuck or 2 1/2 lbs beef rump, cut into 1 1/2 inch cubes 1 1/2 cups onions , chopped 1 cup celery , sliced 2 cups carrots , sliced 2 cups[...]