A kid has the ability to write with his left hand but not his right , but he's able to use his right for other tasks because that's his strong hand. Is he ambidextrous?

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.