The PF Tek ("Psilocybe Fanaticus technique") is a technique or recipe for growing mushrooms using brown rice flour, vermiculite, and half-pint mason jars. The growing method was developed and first made public in 1992 by Robert McPherson aka Psylocybe Fanaticus. It was designed to make the cultivation of mushrooms (specifically Psilocybe cubensis) at home feasible for complete beginners utilizing commonly available materials. The technique is also suitable for many other species.