My best tofu recipie is one of those "eyeball" ones, so I can't really give exact ingredients... It's really simple, though, that I fix for lunch alot when I'm in a hurry but still want a hot lunch.
Cut up s-h-i-t-a-k-e mushrooms into little chunks, onions into half-rings, and tofu into small cubes. Coat all of it with a mixture of soy sauce (The good stuff, if you can get it), mirin, and corn starch, then saute in a pan with a little vegetable oil (If your going vegan, anyhow... I just use whatever oil is handy).