Ted is right. They are olives. Open your eyes! I mean, really now, are you also having trouble seeing that the glass of cognac is XO and not VSOP?
As for olives as pickled grapes, I think Ted may have lost his marbles.
I am with you (I think it was you) that a message of 'there is such a thing as too much' is present. There are two tables, but still it all barely fits. The plate is about to fall. There is a fallen glass in the back on the right.
(What is the object to the left of the gold vessel? It looks like one of the glasses, but upside-down with the base somehow facing us?)
It is all kind of a mess. Doesn’t it look like everything has been shoved to the left? A bowl is tilting left and the platter looks like it got shoved left and bunched up the cloth, as though the cloth had been nicely covering the table on the right. I think dinner is over and some people are on the table over on the right, out of the painting, doing special adult things.