Prepare it like a loose herbal infusion: place the granules in a cup or teapot, pour over hot water, let it steep, then strain if needed. The product information does not specify an exact dose or brewing time, so the most practical approach is to begin with a lighter cup and increase the amount of granules or steeping time if you prefer a fuller taste.
The granulated form helps the tea release flavour evenly, which is useful if you want a consistent cup at home, at work or in the evening. If the infusion tastes too mild, add a little more tea next time rather than steeping for an excessively long time; if it tastes too strong or earthy for you, use fewer granules or shorten the infusion.
It can be enjoyed plain to appreciate the fermented fireweed flavour. If you normally sweeten herbal teas, add honey, sugar or another sweetener after steeping so you can first judge the natural taste. Store the tea tightly closed in a dry place, away from strong-smelling foods, because dried herbal products can absorb odours and lose aroma when exposed to moisture.