[header] How to make mushroom barley soup [title] Chop the vegetables. [step] Wash 1 pound (480 g) of mushrooms , 2 large carrots , 2 large celery stalks, and peel 1 onion. Use a sharp knife to carefully cut the mushrooms into 1/2-inch (12 mm) pieces. 
You can trim the carrots, celery, onion and then chop them into bite-sized pieces. [substeps] Don't worry about keeping the chopped vegetables separate.