Press the tofu for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
Place the tofu cubes in a bowl and toss with cornstarch until each piece is lightly and evenly coated.
In a small mixing bowl, whisk together the tamari, rice vinegar, grated ginger, minced garlic, and red pepper flakes to create the stir-fry sauce.
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 8-10 minutes, turning occasionally, until all sides are golden brown and crispy.
Add the broccoli florets and shelled edamame to the pan, sautéing for 3-4 minutes until the broccoli is bright green and tender-crisp.
Pour the prepared sauce over the tofu and vegetables, tossing constantly for 1 minute until the glaze thickens and coats the ingredients.
Remove from heat, garnish with sesame seeds, and serve immediately.