From the Super Mario Wiki
A Jelly Shroom is a food item found in Paper Mario and Paper Mario: The Thousand-Year Door. It appears to be a red-capped mushroom with yellow jelly poured over it.
The player has to get a Mushroom and a Jammin' Jelly in order to make this dish. Taking these Items to either Tayce T. in Toad Town or Zess T. in Rogueport will make them cook the two objects and turn them into a Jelly Shroom. Jelly Shrooms are recovery items and as such usable both inside and outside of battles. Using them will recover five of Mario's Heart Points and fifty of his Flower Points.
- In the Japanese Version of Paper Mario, Gold Li'l Oinks dropped Jelly Shrooms only leaving 5 copies of the Ultra Shroom in the whole game, which might of been the reason it was changed in the other versions.
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