Is this desecration of the American flag?

I was at a restaurant this evening – ordered a burger with onion rings, cheese, and mushrooms on top. Topping the burger (and holding the onion rings in place) was a small American flag, which looked like this

I was taught that it was illegal to knowingly mutilate, deface, physically defile, burn, maintain on the floor or ground, or trample upon any flag of the United States shall be fined under this title or imprisoned for not more than one year, or both.

and specifically:

(b)As used in this section, the term “flag of the United States” means any flag of the United States, or any part thereof, made of any substance, of any size, in a form that is commonly displayed.

18 U.S. Code § 700 – Desecration of the flag of the United States; penalties

So how is it legal for the restaurant to clean my table and throw away the American flag that was holding my hamburger together?