Fresh pear

 is a food item found in Fallout 3. It can restore some of your Hit Points and gives you no radiation.

Location
They can only be found in Doctor Madison Li's Science Lab in Rivet City, though taking them is considered a crime. Dogmeat can get them for no karma penalty on the PS3, but won't get them on the PC or Xbox.
 * If you wait (manually, not in-game), Janice Kaplinski will eat the ones in the Lab.
 * The scientists have a large stock of fresh fruit and vegetables, and will say, "Be careful, that stuff's worth more than you" or "Don't touch the vegetables, they're fragile".