Meat

Meat is a food item that first appears in Paper Mario: The Thousand-Year Door.

Paper Mario: The Thousand-Year Door
Meat can only be found in Bowser's levels of this game. Meat act very similar to Mushrooms as eating Meat allows Bowser to grow bigger. When he eats enough Meat, he'll turn into Giant Bowser and is able to smash through anything (and acts like a Starman). Giant Bowser wears off in about 10 seconds before Bowser turns back to normal. Meat can be found in blocks or by roasting X-Nauts.