I have multiple food allergies which sometimes means them making something special, so the following may or may not be available generally:
On the Fantasy, they made us the most amazing sourdough bread rolls. We loved them so much after the first night (when they ran out!) our waiter ensured we had plenty each night. A heaping basket with refill if needed. And we ate all of them !

Probably way too much bread for a person to eat, but it was soooo good. It is rare I get decent bread when traveling (becasue most bread has milk in it, so I end up with gluten free bread that is also dairy free, which well, if you have had GF bread you understand it usually is not the greatest...).
We order the butternut squash and french onion soups on multiple nights. Because we order dinner the night before, it is easy for them to make it for us even if it is not on that night's restaurant's menu.
I like Mickey waffles for breakfast. Again, waffles/pancakes are usually a challenge due to milk, so having safe ones is a great and yummy treat.
Finally, on the Fantasy the chef at the pizza QS on the pool deck was able to make me a very nice pepperoni pizza (Udi crust, sauce, tofutti fake cheese); I got it a couple times. On the Dream the pizza they made me was good but not as good as the one I remembered from the Fantasy. Regardless, having *pizza made for me* is a wonderful experience and I really look forward to that. Most normal restaurants it is not an option. Now my sister can have their normal pizza and would often grab a slice as a quick snack [particularly good to help tide one over until later dinner].
SW