Stella does not automatically take food offered to her in her foot so as to hold it while she eats. She is a bit lazy, apparently, and prefers that we hold the food for her, or that she eat it out of a bowl, like a dog. Since there are 6 parrots and only 2 humans, we cannot allow her to expect this kind of personal service on a regular basis, which means that after one or two bites, we'll put the food down on her perch and she'll either grab it with her foot or knock it to the floor.
Unless it's a particular favorite; then she eagerly grabs it with her foot.
Apples are a food that generally she'll eat if we hold or if they're on a plate. She has recently changed her mind, but only when it comes to apples of the Honeycrisp variety. When we offer her apple, she takes one bite. If it's a Honeycrisp, she quickly grabs the apple with her foot. If it's any other kind, she'll eat it only as long as we hold it in front of her.