Know anyone with a grow your own mushrooms at home kit?

I got this kit for Christmas, grow your own mushrooms at home. It is from Plow and Hearth. I don't know how to start the kit. You add water to the soil, but do you grow the mushrooms in the box? Or do you take all the "dirt" out and grow them somewhere else? I've contacted the company, but have not heard back from them yet. Any experience with this thing?