One bite and she wept
The puzzle
A woman took one bite of her food in a restaurant and started crying.
The food was delicious.
She was perfectly well.
Her husband, sitting opposite, understood, and said nothing.
See the answer (spoiler)
Spoilers from here on. If you want to work it out yourself, leave this folded and move on.
Answer
It tasted exactly like the dish her mother used to make.
Her mother had died recently, and the taste brought her back without warning.
Her husband had recognised the dish too.