1. Cut the tofu into 4 thick slices. Places slices in a pot containing 3 cups cold water and the salt. Soak for 30 minutes, then slowly bring it almost to a boil, and cook without boiling for 5 minutes.
2. While tofu is heating, prepare the sauce. Heat the canola oil in a skillet and add the ginger. Stir-fry for 1 minute, then add the cilantro, soy sauce, and sugar. Cook for 1 minute over high heat.
3. Remove tofu from heat, drain, carefully transfer to a warm serving dish, and spoon sauce over it.