Literally 'chicken-egg-fruit' — named for its egg-sized, egg-shaped purple shell. Crack one open and the inside looks like yellow yolk-coloured pulp full of seeds.
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Also commonly called 百香果 (bǎixiāngguǒ, 'hundred-fragrance fruit') in mainland China and Taiwan. 鸡蛋果 is the more botanical/southern name; 百香果 dominates on menus and in shops.