The idea of soups would be to gain FEP without gaining Hunger.
A hearthling could take the essence of a normal food, say a carrot and infuse it into a bowl of water creating an essence of carrot soup.
This essence of carrot soup would give the same FEP as that normal carrot but not fill up any hunger.
The pros to this would be less grinding to lower your hunger and not being overstuffed.
The cons could be possible lowering of quality of the FEP because of the needed water.
An idea like this where you can absorb the FEP of something without filling up hunger would likely be very useful.