Press the extra firm tofu for at least 15 minutes to remove excess moisture, then cut into 1-inch uniform cubes.
Place tofu cubes in a bowl and toss with arrowroot powder until each piece is lightly and 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 in a single layer and sear until golden brown and crispy on all sides, approximately 8-10 minutes.
Add the broccoli florets and shelled edamame to the pan, sautéing for 4-5 minutes until the vegetables are tender-crisp.
Stir in the minced garlic, grated fresh ginger, and red pepper flakes, cooking for 1 minute until the aromatics are fragrant.
Drizzle the tamari over the tofu and vegetable mixture, tossing quickly to ensure everything is coated in the glaze.
Remove from heat and garnish with sesame seeds before serving immediately.