Honestly after having being there for a month i'd say most japanese food is actually "boiled" in some way or another. They don't actually just put things in a pot, is mostly pan sauces and such but most sauces actually have little to no oil and is mostly water, soju or some kind of soy sauce oister sauce.

And it tastes mostly like boiled food, most fried stuff like katsudon and such dishes they garnish it with vegetables instead of europe when you'd see a deep friend chicken breasts with fries on the side they'd put cabbage on the side with some light sauce on it.

Their portions are really small too, they usually have 4 main dishes instead of 3 courses but all small portioned, some protein in the form of fish and stake, a side of white rice, a small salad and some pickled vegetables. They mostly don't have dessert at home and if they do its like a single cookie and such, really small portions.

Most fried food they eat outside.