At a first glance, the long length of the sentence seems to suggest it is a run-on. This is misleading because we basically have one thought being expressed. That thought is "you should try the soup".
The first part "If you have a hankering for a delicious bowl of soup" is the dependent clause which relies on the rest of the sentence (independent clause). The independent clause looks like a run-on all by itself, but it's just in the form of "you should try the soup made of x, y and z" where you replace the letters x,y,z with the ingredients listed. I'm paraphrasing this part of course. Another way you could paraphrase the whole thing is "if you are craving soup, then you should try french onion soup made of various ingredients". I'm sure you can probably get more creative.
There were many allusions to Greek mythology in the story. For example, Grover Underwood, the Satry, is a species from Greek mythology. However in the story he wears clothes so he can attempt to look like a regular kid.
