I just use a rice cooker to cook the rice, but I change it after, usually with plum sauce, but sometimes Cream of Mushroom soup, or recently Sweet Teriyaki, when at home I used a homemade sauce, the sauce may sound weird or gross ingredient wise, but its good, and I cant tell you measurements because it was just thrown together, Ketchup, Molasses, White Vinegar, Brown Sugar. I may make some Onigiri later, if I'm not lazy.