Live in Jiangnan / southern cuisine:
瓠瓜 or
瓠子 is bottle-gourd, a summer vegetable picked young and stewed. The dried mature gourd (hardened, hollowed) becomes
葫芦 — wine flask, ladle, or Daoist immortal's container. The literary
瓠犀 ('gourd-seeds') is a classical compliment for a woman's neat white teeth.