Heat the sesame oil in a wok or large skillet over medium-high heat. Add the scallion whites, garlic and ginger and stir-fry 30 seconds. Add the mushrooms and stir-fry until golden brown and tender, about 3 minutes. Add the snow peas and stir-fry 30 more seconds.
Whisk the reserved soy sauce mixture and add it to the wok. Bring to a simmer, then add the tofu. Cook, stirring occasionally, until the sauce is thick, about 2 minutes. Sprinkle with the scallion greens.
Fluff the rice with a fork and divide among bowls. Top with the stir-fry and sauce.
Photograph by Antonis Achilleos
Courtesy of Food Network Magazine