Making DIY gourmet mushrooms at home is difficult: you must buy a bale of hay, and must innoculate some sterile grain as “spawn.” That, or buy a pre-made “grow block” from a supplier. Instead, what if we use old phone books as the growth medium? Don’t throw out those Mouser and Digikey electronics catalogs, instead turn them into mushrooms. Pleurotus ostreatus (oyster mushrooms) is an easy one.
Mike Stone is right. The ink used in these rotary printing processes is dangerous stuff. And mushrooms are notoriously known to their tendency to accumulate heavy metals and other toxic stuff. Thats why they are used as an indicator of cleanness of environment. i.e. in Eastern Europe after Chernobyl all the mushrooms were radioactive