I have requested things in both Blu and Luminae that weren't specifically on the menu but that were obviously in the kitchen.
For example, I have asked for a real side of broccoli instead of just one or two florets. I have requested other greens as a portion and not a garnish. I love my green veggies!!
Also, on many lunches at Luminae I just asked for an entire plate of salad greens with vinagrette, and a grilled chicken or salmon piece on top. Never have they blinked an eye when I politely asked.
In Blu there was a risotto that we liked, but we just wanted a little taste, so asked for a HALF portion and then we divided that. I also remember that we have ordered a few appetizers as our entree.
I have also, like the cruiser above, asked for a bowl of mixed berries. As a matter of fact, it's my go-to breakfast on nearly every cruise: small bowl of berries, small bowl of vanilla or fruit yogurt, handful of granola and I mix it myself.
I hate to waste food, so on items that I know are over-served I ask for half: chicken and waffles that was in Luminae (may still be) I ask for one and one. I *have* gotten a look like 'are you sure?' Yeah, just one please. No bun on a burger, just meat on the plate. I can't say how many burgers I've eaten at Mast Grill (too many!) and I have never had a bun.
I do all this ------- and then I can enjoy a chocolate martini guilt-free. Well almost. Two? Then totally guilt-free lol.