They might be nice in a stir fry 
Seriously though, I am lucky not to have much of a slug problem except in the Hosta bed so I had this (photo below) which was left from when we had chickens and it's brilliant as I can sink it into the ground to the level of the opening and fill with beer and with the top on the dog doesn't get it and the rain doesn't dilute it and you can just lift the lid and dispose of the contents when you want.
It is roughly 15cm across by 23cm high and made of plastic.