From the Super Mario Wiki
The Hamburger is an item found in the game Super Paper Mario. By having Saffron cook a Power Steak or a Mystery Box, she will make a hamburger patty (without the bun) also known as a hamburg steak, that restores twenty HP and cures Poison. If Dyllis cooks a Power Steak and a Hamburger together, it will result as a Gorgeous Steak.
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