Rice Krispies
Cucumber - diced - ours almost fight over it !
Boiled rice cooked / flavoured with garlic - fresh or 'lazy garlic'
Black sunflower seeds
Dried Mealworms
Fresh fruit - diced apple, plums, cherries (minus stones), banana (in moderation).
Porridge
Yogurt - mixed with some 'layers pellets or mash'
Melon - and if anything left on your melon skin ours completely strip all traces !
All veg' - boiled on its own or then mixed in with plain rice.
Noodles - if only for the comedy value watching them eat long trailing noodles and pinching each others !
Tomatoes.
Wild Birdseed
All the seeds, mealworms, rice krispies etc go in a green treats tin which as soon as they see they're up on tip-toes to try and reach but will follow me anywhere until handfuls are thrown - keeps them occupied for ages scrabbling and searching.............great for getting them back into their run !
Basically.....trial and error, they are like all pets and even humans, some things they like, some they just walk away from ;-)