who knew?:
heather is an ingredient in gruit, a mixture of flavourings used in the brewing of beer during the Middle Ages before the use of hops. The use of heather in the brewing of the modern heather beer is carefully regulated. By law the heather must be cleaned carefully before brewing, as the undersides of the leaves may contain a dusting of an ergot-like fungus, which is a hallucinogenic intoxicant.
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