This appears to have been done by joining the GathicStaota Yesnya with the haoma ceremony.
From the en.wikipedia.org
Haoma services were celebrated at least until the 1960s and 1970s in a strongly conservative village near Yazd.
From the en.wikipedia.org
Fly agaric may be extremely important, since it may have been the natural source of the ritual soma drink of the ancient Hindus and the comparable haoma used by the Zoroastrians.