1. Wrap the tofu slabs in paper towels or a cotton towel, and place a heavy weight, such as a cast-iron skillet, on top. Let stand for 30 minutes to press out the excess water. Cut the tofu into slices about 1/2-inch thick and 2 1/2 inches long. Place them in a bowl.
2. Cut away the broccoli florets and separate into bite-size pieces. Cut the stalks on the diagonal into 1-inch pieces. Heat a large pot of water until boiling. Add the broccoli, and boil for 3 minutes. Drain, refresh under cold water, and drain again.
3. Heat a large, heavy skillet and add 2 1/2 tablespoons of the oil. Arrange some of the tofu slices in the pan and sear over high heat for 3 to 4 minutes on each side, or until golden brown. Remove with a spatula and drain in a colander. Reheat the pan and add 2 more tablespoons of oil. Continue frying the rest of the slices. Remove and drain.
4. Reheat the skillet or wok, add the remaining tablespoon of oil, heat until hot, and add the Seasonings. Stir-fry briefly, about 15 seconds, then add the scallion greens and water chestnuts, and stir-fry over high heat about 1 1/2 minutes. Add the premixed Sauce and cook, stirring continuously to prevent lumps, until it thickens. Add the broccoli, fried tofu and peanuts. Toss lightly to coat and heat through. Scoop the dish onto a serving platter. Serve with steamed rice.
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