That is a completely grammatical correct sentence, but most people do not say it like that. Usually its not that descriptive, just "that really hit the spot" or "that food sure did hit the spot".

Yes it is. "hit the spot" means to give total or desired satisfaction, as food or drink. Examples: It's pretty cold, so I think that a nice cup of tea will really hit the spot. Since it's so hot today, do you think that a green tea ice cream will hit the spot?

Yes, this is correct. When some food "hits the spot", that means it totally satisfies what the person was hungry for in the first place. "Hit the spot" brings the picture of hitting a target.