One jar of pickled onions.
Two slices of wheat bread.
Three slices of cheese.
Two cut pickled onions.
One big mouth.

Of course the above is not a very good chiastic verse. One, two, and three are not the main objects in the sentences. Think more like bread, cheese, onions, and mouth. It could be re-written to demonstrate chiasmus much better. I will leave that as an exercise for the student. For more information on chiasmus, check out these Ensign articles:

Research and Perspectives: Hebrew Literary Patterns in the Book of Mormon
A Clear Poetic Voice