Wrap the firm tofu in a clean kitchen towel or paper towels and place a heavy object on top to press out excess moisture for 15 minutes.
Cut the pressed tofu into 1-inch cubes and place them in a bowl; sprinkle with cornstarch, sea salt, and black pepper, tossing gently to coat each piece.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the tofu cubes to the pan in a single layer and sear for 3-4 minutes per side until they are golden brown and crispy.
Remove the tofu from the pan and set aside; in the same pan, add the broccoli florets, sliced red bell pepper, and shelled edamame with a splash of water.
Sauté the vegetables for 5 minutes until tender-crisp and the water has evaporated.
While vegetables cook, whisk together the toasted sesame oil, tamari, minced ginger, minced garlic, and sriracha in a small bowl.
Return the crispy tofu to the skillet and pour the sesame-ginger sauce over the mixture, tossing for 1-2 minutes until the sauce thickens and coats everything evenly.
Serve immediately, garnished with a sprinkle of sesame seeds for extra texture.