PF Tek is a method of mushroom cultivation pioneered by Robert McPherson, aka Psylocybe Fanaticus, T.P. & Nanook. This technique (Tek) originally utilized organic rye berries, but later included brown rice flour and vermiculite. The substrate is sterilized in half pint wide mouthed canning jars by boiling or pressure cooking, with a layer of dry vermiculite as a filter agent to keep out competing bacteria and fungus. The sterilized "PF jar" is then injected with a solution containing spores and water from a syringe, creating a one step procedure for reliably growing mushrooms indoors.