Kaferian apples were a type of apple that was from Kaferia. A typical Kaferian apple resembled a pomegranate, had dark seeds inside and grew on a tree.
Kaferian apples were the first form of food created by Gary Mitchell after gaining psionic powers in 2265. He told Dr. Elizabeth Dehner that whenever he had visited Kaferia that he always favored the native apples. (TOS: "Where No Man Has Gone Before")
In the script of "Where No Man Has Gone Before", Kaferian apples were described as "huge red fruit" and the tree on which they grow was referred to as "a low, odd-shaped tree."