This recipe worked great in my Nikujaga! I wasn't able to find Mirin but had Sake. I found the corn syrup to be a better option because you didn't have to wait for it to dissolve like the sugar.
The only thing I use mirin for is teriyaki marinade, and I couldn't find any a while ago, so I decided to give this a try. It worked great! Excellent way to use up stale sake, too!
thanks so much for posting this, as i can never find mirin. not even in specialty Asian stores for some reason! it's the strangest thing. i will be using this in the many Japanese and Asian recipes i have.