Two squashes are sold under this name: the black-seeded fig-leaf gourd and the yellow spaghetti squash. Cooked, the flesh of both pulls apart into fine strands like shark fin, used in soups, stir-fries and cold dishes.
After cooking, the flesh of the fig-leaf gourd looks like vermicelli.
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Literally 'shark-fin (鱼翅) melon (瓜)' - the cooked flesh pulls apart into thin strands that resemble shark-fin soup ingredients. Not actual shark fin, just a visual nickname.