From the Super Mario Wiki
Spicy Soup is an item that appears in Paper Mario, Paper Mario: The Thousand-Year Door, and Super Paper Mario.
In Paper Mario and Paper Mario: The Thousand-Year Door, Spicy Soup restores four HP and four FP. It can be made by giving a Fire Flower to Tayce T. (Paper Mario) or Zess T. (Paper Mario: The Thousand-Year Door).
In Super Paper Mario, it restores eight HP and is made by Saffron using a Fire Burst. It also plays a role in the storyline, because after chapter 1, Princess Peach appears unconscious in Flipside. Merlon suggests Mario gives a Fire Burst to Saffron to make some Spicy Soup, which wakes Princess Peach.
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