My DS does it with meat. He loves the flavour and will walk around chewing on it for about 20 mins then all of a sudden will come up to you with a big handful of mashed meat. Also does it with apples. Crazy isn't it, I think he's figured out meat makes his tummy feel heavy so if he just chews it he gets the flavour and the nutrients without the tummy feeling... that or he's just wierd like his mummy!

Just be glad they're not doing it with something really mushy that would squish all over the floor!