How to make mushroom barley soup<br>Chop the vegetables. 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.

Based on that paragraph can we conclude that this sentence is true?
mushrooms have to be cut in a certain way. 
It's impossible to say