It might be useful to add a little bit more yeast than recommended because the tropane-alkaloids affect the yeast. Red pilsener beer is now ready. You can also bottle it, add a few drops of honey to each bottle and let ferment for another week or two. Serve on easter, eclipses and solistices, preferably chilled. Store as normal beer.
Henbane contains mainly scopolamine, especially if it is dried.
So you drink from this, and then you pass it around. Its an entheogenic experience. I drink about 2.5-3 liters of henbane beer to get the full effect. You can drink more of course, but you may start to hallucinate badly. The hallucinations caused by nightshade plants are very unpleasant most of the time.