You might think of barley as an addition to hearty, wintery soups, such as mushroom-barley or beef-barley soup, but it also works well in lighter soups like this one with chicken, asparagus and peas.
Make Ahead Tip: Prepare through Step 3, cover and refrigerate for up to 2 days. Reheat the soup, thin with broth if desired and finish with Step 4 just before serving.