四分律刪繁補闕行事鈔 2.335

2.335

不嚼飯作聲中。除有病、乾餅、焦飯、瓜果者（無開菜文）。

Regarding not making sounds while chewing food: excepted are cases of illness, dry cakes, scorched rice, melons, and fruits (there is no text permitting vegetables).