Since we've recently dusted off on rice cooker, because only used it once and didn't love it, I've rediscovered how to use it. I love it, and use it many times a week. I want to make a brown rice and mushroom dish tonight. I want to get some butter in there for fat, but I wasn't quite sure how to add it. I'm going to cut the mushrooms and onions chunky. Do I need to cook them in the butter first, and then put them into the rice cooker with the rice for the full duration? Or should I add it all into the rice cooker in one go?