What do you call the organ systems that are working together?

A system of organ systems working together is called an organism. It starts with a cell. A group of cells will form a tissue. Then, a group of tissue will for an organ. Having a group of organs, you will have an organ system. Lastly, having a group of organ systems working together make up an organism.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.