I found one interesting facts about the old method of food preservation Afghans developed this method of food preservation, which uses mud-straw containers and is known as kangina, centuries ago in Afghanistan’s rural north. Thanks to the technique, people in remote communities who can’t afford imported produce are able to enjoy fresh fruit in winter months. “Have you ever seen another method that can keep grapes fresh for nearly half a year?” But the clay-rich mud, whose seal keeps out air and moisture like a Tupperware or ziplock bag, protects the fruit from the winter cold, and works best for certain types of grapes. https://www.youtube.com/watch?v=KmQvfonzNuY