Hello! Has anyone tried solar substrate pasteurization using a fridge like this: https://mycotopia.net/uploads/monthly_04_2006/post-4529-13818500211.jpg ? I live in Jamaica and am a newbie. I'm hoping to pasteurize a substrate made of sugarcane bagasse and molasses to grow shiitakes. Would I need to add water to the bottom of the fridge to create steam? Or would the dry heat be enough? I hope to have the inside and outside of the fridge painted black and may purchase a Fresnel lens to concentrate the sun's rays (though it should be able to get pretty hot without much help). Thank you in advance for any advice or tips!