What's this green crispy vegetable or edible seaweed? My grandparents saw, but didn't take, these online images at Chiu Chow Garden restauarant in Central, Hong Kong. They can't remember which website: perhaps OpenRice? What's the scientific name for the green?

Sources: Left, Right picture.
Looks like qúndài cài (裙带菜)/Wakame/sea mustard.