Oh wow I vividly remember in the second grade there's a story of grandma cooking noodles using a solar cooker (it was in the Chinese textbook for Mainland China

Oh wow I vividly remember in the second grade there's a story of grandma cooking noodles using a solar cooker (it was in the Chinese textbook for Mainland China circa 1998). Searching for a couple keywords on Taobao and apparently you can still buy those things. E.g. https://www.taobao.com/list/item/wap/595475929092.htm https://www.taobao.com/list/item/wap/595475929092.htm