This link was found at the bottom of the Viridis wiki page. It looks to have some good info.
500 grams fresh B. caapi vine per person.
85 grams fresh P. viridis leaves per person.
The ayahuasca vine is thoroughly crushed and placed between alternate layers of P. viridis leaves in a stainless-steel or earthenware pot, and covered with water.
The brew is gently boiled for 4 hours.
The liquid is poured off and collected.
Using the same plant matter, the pot is filled again with fresh water, and gently boiled for a further 4 hours.
The liquid is again poured off and collected.
The plant matter is now discarded.
Both quantities of liquid are combined and boiled gently for to concentrate the ayahuasca, until a managable amount is left for each dose.
While the evaporation and concentration is taking place, care should be taken to ensure the ayahuasca is not boiled too vigorously, as this will cause degradation of the active ingredients and will also cause caramelisation of the contained sugars, resulting in a very thick final brew.
I give food to the poor, and they call me a Saint. I ask why the poor have no food, and they call me a Communist..