Apple

Red Apples are food items which fill.

Obtaining Red Apples
In Minecraft 1.0.0 (the current release as of this writing), there are two sources of Red Apples: Red Apples are therefore not a practical continuing source of food.
 * They may be found in stronghold chests.
 * Killing Notch in multiplayer will drop a Red Apple in addition to his inventory.

As of weekly build 11w48a, Oak Leaves have a 1/200 chance of dropping a Red Apple, making them and the craftable Golden Apples now renewable resources.

As of weekly build 11w49a, there is a small chance that a tree grown from a sapling will be an apple tree, which has a much greater chance of dropping red apples when the leaves are destroyed/decay{{Citation needed))

As a crafting ingredient
A Red Apple can be used to craft a Golden Apple.

Golden Apples are very inefficient, as it takes 8 blocks of gold, a total of 72 gold ingots, to make a single Golden Apple, as it takes a great amount of time to find 72 gold ores.

Pros

 * Red Apples can be used as a crafting ingredient to make golden apples.
 * Red Apples are valuable due to their rarity.
 * Apples are technically a renewable resource.

Cons

 * Red Apples can be difficult to obtain, as they only exist naturally in Strongholds and as rare drops from Oak Leaves.
 * Red Apples restore only two hunger.
 * Golden Apples are outclassed by Potions of Regeneration, which can be made in groups of three.

History
Red Apples were added to the game in early Indev. When Indev was still new, Apples were items brought in to replace Brown Mushrooms to heal health. The player would spawn in an Indev House by a chest containing 99 Apples and other tools. In later updates, the chests inside the House were removed, and Apples became impossible to find in a map.

Apples remained impossible to find (without inventory editing or server /give) until Survival Multiplayer, in which one could be obtained by killing Notch. In addition to his inventory, Notch would drop a Red Apple.

In Beta 1.8, apples were made available in the chests in strongholds.

In post-1.0.0 weekly build 11w48a, Oak Leaves have a 1/200 chance of dropping a Red Apple when destroyed.

Gallery
Roter Apfel Pomme rouge Alma Rode appel Jabłko (czerwone) Красное яблоко Red Apple/ch