Before I found out my budgies were allergic to sweet potato, I used to give them raw (organic) sweet potato to shred. The girls loved shredding that stuff. For eating purposes, you have to bake it in order for them to access all the nutrients (vitamin E, choline, vitamin A...), since it's high in starch. Hey, Inger, you gonna try giving Bumble what she'd eat in the wild? Go buy her a prickly pear, put on some gloves (they have tiny little prickles that get stuck in your skin), peal it, then serve it to her in your bathtub. It looked like the scene of a murder when I gave some to Noah, so no more for him! He managed to fling the juice more than 4 feet away!
Oh, on a good note, the kids are eating their chop now. Oh, and Inger, go on Things for Wings and check out the mashes by Avian Organics. My guys love those mashes, and if you buy a bag of each, you could look at the amount of each ingredient and recreate it for Bumble. Then again, every single ingredient in those mashes is organic, and you'd have a heck of a time finding only organic ingredients...