Here are some suggestions of what to feed your favorite pet:
Pork (well done)
Chicken (without bones!!!)
Careful with too much protein as rodents do lack an efficient digestive system and should therefore acquire most of their energy requirement through the seeds and nuts they eat.
Its wise to stay away from too much homemade foods since the animals seem to have relatively specific needs. Thus, I would recommend you to give your animals as much petshop food as possible.
HamsterLand.com - Cages for Hamsters
Hamsters and Gerbils
PDSA - For pets in need of vets
CreeyGuy on Hamsters