Cut the tofu into cubes. In a bowl, mix soy sauce and sesame oil. Add tofu cubes and marinade for 15 minutes.
Meanwhile, in a small bowl, mix all ingredients for the sauce. Set aside.
Add corn starch to the tofu and mix to cover well.
In a large, non-stick pan, heat 1 tbsp. oil on medium-high heat. Add tofu and cook until golden brown on all sides, occasionally turning over (approximately 8 minutes). Add pepper, remove from pan, and set aside.
Still on medium-high, heat 2 tbsp. olive oil. Add garlic, carrots, red pepper, and broccoli. Fry for 4 minutes while stirring, then add the sauce and cook for 4 more minutes or until the vegetables are cooked but still crunchy.
Add tofu to the pan and cook for 1 minute or until everything is hot. Sprinkle with sesame seeds and serve as is or with rice.