Half a Golana melon.

Golana melons were a small species of melon native to the planet Golana. They had an orange skin resembling a grapefruit, dark green flesh, and a pale orange core.

Chief Miles O'Brien offered half a Golana melon to his daughter Molly in 2374 to placate the feral child, who had come back after spending several years alone back in time. (DS9: "Time's Orphan")

The melon may have been an African horned cucumber. [1]
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