Press the firm tofu between paper towels for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
Place tofu cubes in a bowl and toss with cornstarch, sea salt, and black pepper until evenly coated.
Heat the toasted sesame oil in a large non-stick skillet or wok over medium-high heat.
Add the tofu to the skillet and sear for 3-4 minutes per side until golden brown and crispy.
Add the broccoli florets, sliced red bell pepper, and shelled edamame to the pan, sautéing for 5 minutes until vegetables are tender-crisp.
In a small jar, whisk together the tamari, rice vinegar, grated ginger, and minced garlic.
Pour the sauce over the tofu and vegetables, tossing constantly for 1-2 minutes until the glaze thickens and coats everything.
Garnish with sesame seeds and serve immediately.