Press tofu for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
Toss tofu cubes in a bowl with arrowroot starch, sea salt, and black pepper until lightly coated.
Heat a large non-stick skillet over medium-high heat and add half the sesame oil.
Sear tofu for 8-10 minutes, turning occasionally until all sides are golden brown and crispy.
Remove tofu from the pan and set aside; add the remaining oil, broccoli, and bell peppers.
Stir-fry vegetables for 3-4 minutes until tender-crisp, then add edamame, garlic, and ginger.
Whisk tamari with a splash of water and pour into the pan, returning the tofu to the skillet.
Toss everything together for 1 minute until the sauce thickens and coats the ingredients.
Garnish with sesame seeds and serve immediately.