Fresh apple

 is a food item found in Fallout 3. It can restore some of your Hit Points without radiating you.

Locations

 * Fresh Apples and all other fresh items are mostly found in Rivet City Science Lab. There are four apples here but be aware that taking them is a crime. Dogmeat can get them for you with no negative Karma on the PS3, but not PC (nor Xbox?).
 * One can be found in the ladies' room of Arlington Library, at the base of the garbage can.