Many things. [ Not all of them lethal, thankfully. That's probably the wrong answer to give a new-ish acquaintance. ] Incenses for sleeping, antidotes. No recipes of my own invention. I knew a very skilled healer, once.

[ And helped him run an underground drug ring beneath the emperor's nose, but that's besides the point. He gives the Doctor a slightly measuring look, even as he nods his approval for the pot. ]

This is just curiosity for you?