Cook the rice according to the package directions, then set it aside.
In a small bowl, whisk together soy sauce, sesame oil, rice vinegar, garlic, ginger, and 1/2 cup scallions. Set aside.
Set a large skillet over medium-high heat and add the vegetable oil. Once hot, add the tofu in a single layer. Cook for 8 minutes, turning every 2 minutes, until the tofu is lightly golden.
Reduce the heat to medium. Pour the sauce into the skillet and gently stir to coat the tofu. Cook for two minutes, gently stirring occasionally.
Working in batches, stir in the spinach, letting each batch wilt before adding more. Continue cooking, stirring occasionally, until all spinach is wilted.
Sprinkle with the reserved 2 tablespoons chopped scallions and serve hot.