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In page Steaming:

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Some of the world's earliest examples of steam cooking were found in China's Yellow River Valley; early steam cookers made of stoneware have been found dating back as far as 5,000 BCE.[1] And also in Gunma Prefecture, Japan, created during the Stone Age.[2][3] Some of the earliest examples of steam cooking have been found in Italy and Sardinia, created during the Bronze Age,[4] and in Cochise County, Arizona, where steam pits were used for cooking about 10,000 years ago.[5] From the eighth century CE,[citation needed] thin cypress strips were used to make steamers; today, their slatted bases are constructed from bamboo. The classic steamer has a chimney in the center, which distributes the steam among the tiers.[citation needed]