From the Super Mario Wiki
The Fire Burst is an item in Super Paper Mario. It boils enemies with searing flames. When used, the player must shake the Wii Remote up and down in a sideways position to fill the meter all the way in order to do maximum damage to enemies. It is the only ingredient needed to make Spicy Soup in this game. This is obviously the replacement for the Fire Flower, which was used in the last two games of the series. The Fire Burst deals one damage to all enemies onscreen for each bar that is filled.
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