Brown the sides of the beef cubes in a large saucepan with red onion and crushed garlic. Once all sides have browned, add the beef broth and water.
Bring to a boil, then add the pearled barley. Let cook at a rolling boil for 20 minutes.
Season with salt and pepper to taste.
Prepare rolls, or pull bread from the freezer.
Warm corn as directed on the can.
Serve Beef, Mushroom and Barley Soup with bread and corn.