I'm not sure whether this belongs on the travel site or IPS, but since I'll be a tourist, I'm gonna post it here.
I'm going to visit Japan soon and I'm a bit of a picky eater. I've already figured out that when I have special food requests I should ask about them on reservation time and not on arrival. I've also read that it's impolite to pick apart your food (same in my country, Germany) and I wouldn't do that.
However, what does sometimes happen is that I get a dish with mostly things I like and one thing that I'd rather avoid. For example, here I might get a Schnitzel, Fries and a Salad with unlucky ingredients. I'm gonna eat the Schnitzel, the fries and just leave the salad be. Or I have a soup with mushrooms and I'll eat the soup but in the end there will be all the mushrooms left in the bowl. (It's not really hard to 'eat around' soup ingredients so I don't consider it picking it apart).
I usually leave things be here (even though I still feel bad) but I wonder if this would be impolite in Japan.
I'm happy to try anything that I'm being given, but I think I'll come across something I just won't like eventually. How do I handle it? Can I say something to the waiter/waitress/host to save the situation?