Pretty much all Fast Food restaurants. (McDonalds/ BK/ Domino's/ Pizza Hut/ Starbucks/ Taco Bell/ etc)
Go try some local stuff. You will not regret it :)
I'm Guatemalan
McDonalds, Burger King and Dominos pizza...
Little ceasers, kfc and some guy selling bad "gingas" , flour tortilla with meat on it on zona 6.
I don't know , all i ate was pollo campero , BK and Mc Donald's , i also had some local food but it was all great .
How would I know?