[cypher]

Harry Hamster is fine on it's own, you can give a little chicken once or twice a week if you want to feed a little extra animal protein, they do only need a tiny amount too, you could also try some mealworms but not all hams like them.
Lentils can be fed raw but do sometimes cause bloating so not the best thing to add tbh.
A small amount of fresh veg daily, as much variety as possible, something different each day within the safe veg list is all he needs really for any extra fibre.

Another option if you really feel your hams diet is short on fibre is breakfast cereals, mine (dwarfs) have an unsweetened bran flake once or twice a week, more as a treat than anything just because they love them but it does add a significant amount of fibre.