I am getting married in a month's time and my Chinese-speaking father has invited some of his Chinese friends to my wedding. He is and his friends are elderly and their English is almost non-existent. ...
Is the vegetable 菜心 (Choy Sum - English rendering of Cantonese) called 菜心 in Mandarin? Is it pronounced "cài xīn" or is it pronounced as it would be in Cantonese?