Option number one:
Be excruciatingly boring and stick to certain double arc fast food chains and other American-style eateries you may be able to find where you are. That basically includes Lima and Cuzco and offers no real guarantees. Besides lame food, that is.
Option number two:
Check yourself into a luxury western chain hotel and never go anywhere but the hotel restaurant. Same principles as above apply. Yaaaaaaawn.
Option number three:
Be adventurous and go where your gut takes you, literally. If this option appeals, keep on reading for some more tips below.