That is an interesting recipe, I think I see the problem with my mugwort beer, I put in about 1/4 the amount of mugwort your recipe calls for, plus I had no idea how much yarrow to use (I picked it fresh).
If anybody wants to know where to get mugwort try a wiccan bookstore there's all kinds of great herbs to be had there. :fro:
Yarrow is a tricky herb. Most people do not understand how to use it, including myself until recently. I had an email exchange with Stephen Harrold Buhner, author of "Sacred Herbal and Healing beers", in which I explained my struggles in making a palatable gruit ale.
He explained that yarrow leaves are exceptionally astringent, and that the best way to utilize the yarrow plant in brewing is to only use fresh flowering tops.
He suggested bringing the wort to a boil, putting the yarrow tops in it and turning off the heat, then covering and allow it to cool. (I assume the purpose of leaving the top on is to prevent the volatile aromatic floral compounds from escaping)
He also suggested simply steeping some fresh yarrow flowers in the beer in the secondary.
I have not had a chance to try these techniques yet, but I can say from experience that yarrow is a potent herb. I have ruined two brews because I did not know how to use it properly.
Mugwort, on the other hand, is pretty straightforward. I find that it makes a great hops substitute, though it doesn't have much in the way of aromatics (you can get that from other herbs and spices) it is a powerful preservative and bittering agent (it is in the same family as wormwood) with a slightly spicy flavor.
I strongly recommend that Mugwort stout recipe as a first step into brewing without hops, assuming you already have experience with All-Grain brewing. It turns out quite excellent and ages nicely.
I bet if you gave it even to a beer judge without telling them it is totally hop-less, they wouldn't know the difference. They would probably be able to tell it has other spices and herbs for flavor and aroma, but the mugwort does just as good a job as the hops at bittering, you'd never know.