The Japanese style karei-rice (curry rice) is a very traditional japanese food, though one might not think so. Of course, it wasn't historically so, but since curry spices were imported, it has become a staple of Japanese cuisine.
The Japanese Kare-rice is a thick creamy roux, with flour and potatos stewed until it is crumbling in the curry. Most standard kare-rice will have a few morsels of beef as well. Served on a plate of white rice, so that half of the plate is white, the other half of the plate is covered in curry, it is garnished with red pickles (fukujin-zuke). Curiously, that is about the only time you will see fukujin-zuke served in Japan.