Answer:
The lunch destination of choice for teenagers and hospital employees.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
MT_TF_S What are the missing letters? Why?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
There is a woman in a boat, on a lake, wearing a coat. If you want to know her name, it’s in the riddle I just wrote. What’s the woman’s name?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?