I fondly remember the Potato and Bacon Pies from when I went to McDonald’s in Tokyo in 1992. I’m happy to see that they still have lots of unusual items available. The Korean barbecue beef burger was probably the best, but the curry pies they have now are pretty yummy, as is the tofu burger.
If you’re vegetarian, don’t get excited – I am told that the tofu burger also contains chicken. They don’t really “do” vegetarianism in Japan.
Rumours of the natto burger (extremely pungent fermented bean) are persistent but still unconfirmed.