Simple plugin really. It automatically destroys the empty soup bowls when they are dropped. I made it possible for any item dropped to be destroyed via a list in the config.yml
discardbydropping.BypassDiscard Drop Soup and They Don't Disappear
discardbydropping.SeeList Shows a list of items that will be discarded with command : /discardbydropping.
I used the spigot item list from here : (Big URL) : http://tinyurl.com/okqdcvo
Added option to make sure dispensers and the like don't drop the item either