Well, almost all of them anyway: any white potato.
The U.S. Department of Agriculture is proposing to eliminate the "white potato"--defined as any variety but the sweet potato--from federally subsidized school breakfasts and to limit them sharply at lunch
Seems that some schools have been dipping the potatoes in things that make the vegetable more appealing, like (gag) chocolate.
First junk food, now potatoes. What's next, broccoli?