What is your recipe for oyakodon?

I'm very pleased to say that there is an AMAZING Japanese grocery near the university I'm transferring to next fall. It has a little cafe that offers soba, udon, curry and other goodies, a great grocery with lots of Japanese produce, ready-made bentos, AND onigiri!. There is nothing like this where I live right now so I'm pretty excited.

But anyway, I tried their oyakodon bento and it was delicious! A far cry from my attempts at oyakodon, even though it was cold. I think perhaps I'm too hesitant with the sugar.... Anyone have a good recipe?