In a skillet brown the onion over moderately high heat, stirring
occasionally, add the mushrooms and saute the mixture, stirring
until the mushrooms are tender. Add the garlic and the ginger and
saute the mixture, stirring for 1 minute. Stir the corn starch
mixture, add it to the skillet with the soy sauce, the tofu and 1/2
cup water, and simmer the mixture, stirring gently and turning the
tofu to coat it with the sauce for 2 or 3 minutes. Stir in the snow
peas and cook the mixture stirring gently for 30 seconds and serve
the tofu mixture over the rice.