It isn't a fruit - hang on, yes it is
It isn't ball-shaped
it grows above ground (hesitatingly
you would want to eat it while it is green
it isn't eaten with the skin on (but it could be)
the part you eat is below ground while it's growing (but it could be above ground)
It's not necessarily eaten cooked
... and it's not a pomegranate, pepper or pineapple.