Found in the Lunch Room

At work we have a small lunchroom - too small, but that's another story - in which is left, from time to time, some item that, being food in the past, is now used for a different, but I'm sure, very important purpose probably, if not surely, inedible.    I sometimes do these experiments myself at home, so it was a vaguely familiar sight, even if subconsciously in the back of my brain, a little disquieting.

Something's "cookin"!

I see some thick green goopy stuff on top.  Must be working.