Typically, my imagination is going in all sorts of weird directions:
This skill is something Hannelore learned during her travels, from the monks in an obscure monastery in the Himalayas;
Hannelore puts too much
oomph into the tea - upon her first sip, Claire is overwhelmed by Hanners'
LOVE AND SUPPORT, falls madly in love with Hannelore and dumps Marten;
Marten inadvertently smells the tea on the way home, blacks out and wakes up two days later in an alley, with no recollection of what happened in between, except that he has a wedding ring and a tattoo on his chest that says "Hank";
Dora sees the effect and, dollar-signs in her eyes, starts selling Hannelore's metaphysically-enhanced teas until the Food and Drug Administration shuts her down;
etc...