They were the pioneers of refrigerator technology
Of course, the Persian Empire didn’t invent the huge white refrigerators produced by LG that we use on a daily basis. However, their technology known as Yakhchals was quite helpful in preserving food. In essence, their “refrigerators” were large underground chambers built with the help of nature, or more precisely wind. The wind catchers, combined with ice and heat-resistant mud bricks on top, helped with preserving the food during the (very) hot Persian summers.