Apple

Apples are recurring items in the The Legend of Zelda series.

The Legend of Zelda: A Link to the Past
Apples, which restore hearts, can be found by knocking them out of trees with the use of the Pegasus Boots. They also play a part in the quest for the Whirlwind Sword Attack in the Game Boy Advance port.

The Legend of Zelda: Twilight Princess
Apples are sold in the southern thoroughfare of Hyrule Castle Town, along with bread and flowers. When Link examines one, the "item found" sound plays, but the game will say:
 * "You got a sweet-looking apple! It looks just ready to eat, too! Hmm... Yes... The ones over there are sweeter, so let's put this one back."

It is impossible for Link to actually pick them up or use them in any way.