Best Japanese Curry Recipe

Japanese Curry sounds interesting and I want to try it. What is the best Japanese Curry Recipe. I know it is a little thicker than the traditional Indian Curry.

I make lots of curry food like chicken curry, chicken gizzard curry and might want to try these same recipes using Japanese curry. So I don't necessarily need actual Japanese recipes although I wouldn't say no. But the actual mix that makes up the Japanese curry would be a great help.