De-cocainized flavor essence is a name for an ingredient in modern-day

Coca Cola is the answer. Hope this helps. :)

C= syphilis would be the answer

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.