Mentaiko (Pollack or Cod Roe) spread on freshly baked baguette.
I have to pick some up whenever I am near Sun Moulin Bakery in Isetan. I know mentaiko is commonly savoured in Jap fusion pasta. But, I love mine spread on a piece of freshly baked crispy bread. The bakery also has some really delicious croquette sandwiches, fluffy tufts of potato piping hot from the oven, with just a drizzle of sauce.
Sometimes, when they fly in the regional Japanese chefs, you can get awesome sushi. With all the authentic local flavours of Japan.