I know you weren't talking to me, but...Uni. I am not fond of sea urchin. Also don't much like raw mackerel sushi or salmon skin rolls.
If I had to stick to just one meal and never change it up, it would be my crab-meat stuffed grouper, which has crab-meat (obviously), red bell pepper, garlic, red onion, fresh basil, chopped spinach, bread crumbs, grated parmesan, butter, and olive oil. Then a fine slab of fresh grouper filet to butterfly and stuff, broiled with more lemon butter atop. That pretty much covers all my food groups so I would be able to survive on that as well as enjoy it. I would like the option to turn the leftovers each morning into an omelet, so if some eggs were allowed I would be quite happy.