Today's Dinette Set, features people unclear on the concept on the textual and meta-textual level. That Burl does not understand should come as a surprise to absolutely no one. That the artist tortures the English language in a desperate attempt to make this joke fit into the setup also should come as a surprise to no one.
Not that it's not annoying as hell and totally unecessary. Assuming the artist is not paid by the word, I suggest the following:
Timmy: Did you know millions of kids in other countries go to bed hungry?
Burl: Relax. I'm going to finish everything on my plate.
At that point, all one needs to do is draw a comically over-stacked plate of food. Which, I know, is asking too much.