So my brother caught a couple pounds of eel last week that are now in my freezer. I want to grill and serve them over a bowl of rice, a la something I had at a japanese friend's a few years ago. But I have no idea how to go about making the barbecue/grilling sauce. It wasn't teriyaki, although I suppose it could have been teriyaki based. It was very similar (probably identical though I wouldn't swear to it) to that little bit of sauce that comes on grilled/smoked eel sushi.