Ovens made of super-heated rocks allowed primitive humans to cooks lily bulbs, wild onions and other plants for days to make them edible.
Long before early humans in North America grew corn and beans, they were harvesting and cooking the bulbs of lilies, wild onions and other plants, roasting them for days over hot rocks, according to a Texas archaeologist. ...
... The evidence for this practice has long been known of in fire-cracked rock piles found throughout the continent, but archaeologists have tended to ignore it "because a new pyramid or a Clovis arrow point is much sexier," said archaeologist Alston V. Thoms of Texas A&M University.
Full Story: When the woolly mammoth ran out, early man turned to roasted vegetables; By Thomas H. Maugh II, on the LATimes.com
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