Using a tofu press, press the tofu to extract excess water (or create some system with paper towels and heavy pans to press out the water)
Meanwhile, mix all the sauce ingredients in a small bowl until the sugar and cornstarch are dissolved.
Cut the pressed tofu into cubes. Toss in the 2 tablespoon cornstarch until coated.
Heat the oil on medium heat in a skillet. Brown the tofu on all sides. Transfer to a plate.
Heat the broccoli in the same skillet and add in the sauce. Allow to bubble, then turn to low. Allow to simmer until the sauce has thickened. Add in the tofu and serve with rice.