Any fruit that is normally eaten by holding it whole in one's hand (e.g. apples, bananas, etc.)
Fruits that are only palm-able by giants or people with hand deformities (and palm-able things that are not fruits) don't count.
A: Is a casaba a hand fruit?
B: Only if you're Andre the Giant.
A: Excuse me, could you direct me to the Hand Fruit section?
B: The what?