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.