You can grow that.

No need for the grocery store when you can grow your own shiitake or oyster mushrooms at home! This at-home project will yield mushrooms for the next two years. Here's how it works: the logs are hand-cut and inoculated with shiitake or oyster mushroom spores in visible drill holes that are covered in cheese wax. A metal plaque on the underside of each log states the date of inoculation. Just soak the log for 24 hours in cold water, mist it occasionally, and watch your crop emerge once the inoculation period is reached (the inoculation period is 6 to 12 months).