Oyster mushrooms grow throughout North America. If it rains enough and it's not too hot or cold, you can find them any month of the year, although they're most common in the second half of autumn.
Cut out any part near the stem that's so tough you can't pinch through, and save it for stock. Cook the tender parts using any method. 10-20 minutes. They have a soft, chewy texture and it taste a little like seafood. Use seasonings suitable for seafood for a mock seafood effect.