I've had good luck with carrots and green beans. I use fresh carrots and cook them in the crock pot with whatever dogfood I am making. This last dish was diced sirloin, red potatoes, carrots, and a little celery. I seasoned it with low sodium beef broth a dash of garlic powder and cumin. Gucci loves cumin!
I've fed her green beans before, steamed fresh ones.
She will also eat yellow squash, and yellow tomatos (they are low in acid, whereas the red ones aren't).
I am going to start introducing more veggies, so I'll let you know how it goes!
I put the fruit to the side of her meal, she usually eats around the fruit anyways, so I save her the trouble!
I should add, that she does NOT like sweet potatoes! I've tried them several times, because they are such a great source of nutrients and she wants NOTHING to do with them!
But I would surely try them! They are a great choice.