From the Super Mario Wiki
The Fruity Hamburger is a recipe by Dyllis in Super Paper Mario. It is made from a Power Steak and a Keel Mango. A Hamburger may replace the Power Steak and a Peachy Peach can also be used instead of the Mango.
Its description states that it's a fruit-filled hamburger, but it looks like a normal hamburger patty with berries in front and the mango in the back. Using it restores twenty-five HP and cures Poison.
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