The food in Peru is excellent and there are several dishes suitable for kids - Peru's famous chicken dish Pollo a la Brasa for example. However, in case your children aren't impressed they won't starve to death. The offer of fast food chains in Lima ranges from Mac Donald's, Burger King and Dunkin Donuts to Pizza Hut, Papa John's, China Wok and KFC. Just for the case ...
You find them nearly around every corner or at one of the shopping malls. Around town there are also numerous very good small "restaurants" called sangucheria selling great sandwiches. And for dessert try an ice cream at the Gelateria Laritza or 4D. Both sell yummy creamy ice cream made of fresh ingedients and have several locations in the city including some in the big shopping malls.