After reading this (and the article the author wrote about the experience of playing a whole session with it) I've decided to write a plot line where the party needs to poison a boss. The poison is undetectable, but as a trade-off, requires the target to consume a large volume all at once. Depending on how good the dish they cook is, they will either successfully kill him, passing the encounter, or trigger a battle of varying degrees of difficulty. Great work!