You can if the recipe of the soup is calledBeef, Leek &Barley Soup.
In our vegetable and spice soup, we used barley out of many other vegetables.
It's just soup with mutton, barley, carrots, tunnip and onio ^_^
1
Yes, you can, but you may need to adjust the amount of the other ingredients, especially liquids, because egg noodles are much larger than barley and will thicken your soup.
Scotch Broth
Well here in the United Kingdom we'd call that "Cock a'leekie soup".
Most beers contain barley. Other than that, not much. Barley water, obviously, You can get barley grits and barley flour, so also barley breads. Pretty uncommon though. Pearl barley is used a lot in soups, but mostly only in home cooking, not so much in canned soup.
Whole grains of any type are good for you. I put it in soup!
Usually a barley soup and bread. This was the main food for them. Sometimes some fresh meat or fruit, but barley was cheap and easy to make.
Pearl barley does not need to be soaked but it will be fluffier if you can soak it for at least 4 hours or ideally overnight.
Purple.