On LSD, absolutely nothing. I look at food as if it's some alien object and my appetite completely vanishes. I can get pretty hungry on shroom trips and flavors are brought out a ton more though. I'm surprised anyone would feel hungry on LSD.
I always make a really nice tomato soup before I trip at home. Take my time and do it right. I eat that on the comedown, with some homemade sourdough toast and butter or a grilled cheese if I’m feeling up to the task.
During the trip (shrooms or acid) fruit is the only thing I can eat. And it tastes fucking awesome.