Probably the one thing I can think of that my two will turn down is mashed potatoes and gravy. I really thought that would be a treat for them. No, they both turned their noses up and walked away!!
I give them eggs regularly, hamburger or other meats on occasion, all kinds of veggies, yogurt, macaroni, and I have to admit even if it's not good for them, they LOVE a vanilla ice cream cone. This I will give them rarely, since sugar is not good. But they'll gobble it up in a heartbeat and have white beards dripping down. It's so funny!!