Press the extra-firm tofu between paper towels for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
Place the tofu cubes in a bowl and toss with arrowroot starch until each piece is 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 8-10 minutes, turning occasionally, until all sides are golden brown and crispy.
Remove the tofu from the pan and set it aside on a plate.
In the same skillet, add the broccoli florets, sliced red bell pepper, and edamame, sautéing for 5 minutes until tender-crisp.
Stir in the minced fresh ginger and garlic, cooking for 1 minute until highly aromatic.
In a small jar, whisk together the tamari, rice vinegar, and red pepper flakes.
Return the crispy tofu to the skillet and pour the sauce over the tofu and vegetables.
Toss everything together for 1-2 minutes until the sauce thickens and coats the stir-fry, then garnish with sesame seeds.