Heather beer, is made the usual way, but when you strain the beer at the end you run it through heather contained in muslin, you do this several times. You do not put the heather directly into the beer but use it as a straining medium to wash the beer through, you can do this with lavender or rosemary too (however beware of the latter as taken in large quantities it has a hallucinogenic quality).

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Best wishes
Andrewo
Harbinger of Rhubarb tales