The oldest known recipe in the world is for beer.
Why it is true
Dating back over 3,900 years to ancient Sumeria, the recipe was written on a clay tablet as a poem honoring Ninkasi, the patron goddess of brewing.
Source: Archaeology
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.