Which mineral is needed for healthy red blood cells? iron calcium potassium sodium

A. iron
Iron also helps with the production of red blood cells as well

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.