Golden Apple

The Golden Apple is an apple in Super Paper Mario that only appears once in the game. In The Overthere, after going through Door E, Mario, Luigi and Bowser will find Princess Peach fast asleep after she ate the apple.

Luvbi explained that the Golden Apple is so delectable that anyone who eats it will end up falling into deep sleep for 100 years. She also says that there's a taboo fruit around that may restore her consciousness. The fruit that Mario and his team must get is a Black Apple, the only fruit that wakes up Peach. (All other fruits do wake up her, but they also transform her in humorous ways as a side effect, such as making her giant, giving her a mustache or changing her into an actual peach.)

Trvia

 * The Golden Apple can be an allusion to Greek mythology, where legend tells of an apple tree of such sort at the far end of the world. It's also said that the golden apples from this tree will grant immortality.