How do I harvest a mushroom?

A mushroom is best harvested by being pulled off the casing or cake with a twisting motion.

A mushroom is best harvested by being pulled off the casing or cake with a twisting motion.
You can also cut the mushroom as close to the base as possible. Do not worry about leaving behind a small stem, it will not rot or otherwise contaminate your cake.
After the mushroom is harvested, clean away any remains of vermiculite or casing that are attached to it.