People naturally romanticize food of foreign cultures, but I can't help but giggle at the crazy hype given to Japanese food in particular. Especially considering how 'bland' the food is (at least, how bland it is to the American sensibility).
These days, I direct touristing friends towards foreigner-friendly restaurants that promise some sort of food "experience" (at the prices you'd expect)...while I mosey over to the nearest salaryman friendly hole-in-the-wall for some plain zaru soba or udon. One part because I'm eternally broke, and another because I genuinely like it more than the ungodly katsu-don concoctions larger than the standard birth weight.
Not that there isn't interesting 名物 depending on the region (although naturally the 名物 of Tokyo might as well be Taco Bell), but I've always found my friends to be disappointed by "real" Japanese food...even from the Yatai of my local Fukuoka (which is pretty darn good, as far as I'm concerned!) Let alone from places like rural Tohoku (the village a friend resided in had a specialty of whole-salamander tempura...bluegh).
Well, that's only true if you also observe what Japanese customers are buying and do your best to mimic their habits.
You could go into any Italian supermarket and fill your cart with weißwurst, avocados, and Camembert cheese - and they're all right there in the meat, fruit, and dairy areas respectively, not in an 'ethnic' corner - but it would be hardly a good representation of what the locals typically eat.
Maybe I want to know a decent place I can get a cheap hot meal too, but I'm not interested in fancy meals or nice restaurants. I want the workaday egg salad from the tiny deli in New York that costs 4.99 and comes with a pickle. I want the simple pho that's the only thing on the menu. I want the tamales sold from a cooler in the Home Depot parking lot.
I wish there was a better way to signal that's what i want to find than, "Whats a good place to eat?"
As for actual restaurants, I think the mistake tourists make is trying to find the best ramen or whatever, but the best isn’t going to be that much better than the average joint catering to locals. So in other words, spend less time thinking about where to go and just explore and pick a random place that you like the vibe of, that’s what I do and I’ve never been disappointed here.
I don’t really have time to say all that to every tourists that asks though lol.
Also I’m literally writing this from a random ramen place I walked into, and it was delicious!