Teriyaki

Maki: I made your teriyaki chicken bites and they were WONDERFUL! I saved a few bites, chopped them up and made onigiri with chicken filling, Yum! My question is can the marinade be used as a teriyaki sauce? I mean make it, don't use it as marinade but maybe cook it on the stovetop to thicken it slightly? It seems very thin and watery as a marinade but thickened up as the chicked cooked. Would cooking it maybe thicken it up? I'd really like to have it as a side sauce for the onigiri and other things. Its so much better than the bottled stuff I can get.... Wonderful recipes on your site and I love your photos too!