3 June 2018 Tempeh Posted on June 3, 2018 by Durgan http://durga. n.org/2018/June%202018/3%20June%202018%20Tempeh/HTML// 3 June 2018 Tempeh Made tempeh. Had too many soy beans for my metal molds so used ziplock bags for the excess. Holes were poked through the bags with a meat fork, since the process requires air. The batch was perfect after 30 hours of fermentation.