The Dwarves are often thought to be a greedy and miserly race, but there are times when they will give rewards to those who have genuinely earned them.
(OOC-I added the names of all those who did submissions but only mine has shown up, for some reason. The others are the following; axlerowes, Echomirage, Ancient Gamer ,Dossta , Pariah.)
You find a patch of edible funghi. They taste well and all, no ill effects. UNLESS you consume some beverage, even 3 (three) days after eating it. Then you become really sick with pains, vomiting, all the fancy stuff. As a gift or good meal, it could be a cruel joke or to make sure the heroes spend their time focused on the mission. And the fine soup you had in the inn yesterday could have some in.
(Inspired through a real-world fungus. Was really used to cure alcoholism.)