Is this edible fruit? Or only used for the seed?
From wikipedia: "G. kola seeds have both seed coat dormancy and physiological dormancy probably imposed by the chemicals in the seed.[9] Seed coat dormancy of Garcinia kola can be reduced by removing the seed coat before sowing, while physiological dormancy can be reduced by soaking in water for 72 hours.[10] Removal of the seed coat, soaking in water for 72 hours, placing inside air-tight transparent polythene bags and sprinkling water on the seeds when needed for constant moisture gives an early germination period of two weeks,[10] while the combination of freshly harvested seeds, pierced minimally and tied in black nylon reduces the germination period to between five and seven days as the piercing or nicking procedure makes for quick availability of water and oxygen to the seed embryo.[11"
EDIT found more info:
"Edible Uses
Seed - raw. They have a bitter, astringent, aromatic flavour; somewhat resembling that of a raw coffee bean
The seeds are chewed along with the seeds of the true cola (Cola spp.). They are thought to enhance a person's enjoyment of the cola as well as allowing for consumption of larger quantities without indisposition
The extremely sour fruits are sometimes eaten. They are orange-sized, and contain a yellow pulp surrounding four seeds"