How do I get a meatball?

The first thing you need to do is remember that the meatballs are being fed
to someone.  Someone who is very picky about the way his meatballs are served.

For one thing, he doesn't like any extra seasoning in his food.

Fingus is enough of an expert cook not to tamper with people's food.

So have Winkle sprinkle some pepper on the pile of meatballs.  Wait a bit and
you will see the results.

Notice that the cook is away from his case for a few seconds.  Maybe you could
use his absence as a chance to get rid of him more permanently.

The guard will drop the cook back on his case after a bit.

You should think about putting something on the case to make the cook's
landing very unpleasant.