Press the tofu for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
In a large bowl, toss the tofu cubes with arrowroot starch, sea salt, and black pepper until each piece is evenly coated.
Whisk together the tamari, rice vinegar, minced ginger, and minced garlic in a small jar to create the stir-fry glaze.
Heat the toasted sesame oil in a large non-stick skillet over medium-high heat and sear the tofu until golden and crispy on all sides.
Add the broccoli florets and sliced red bell peppers to the skillet, sautéing for 3-4 minutes until they are tender-crisp.
Pour the prepared glaze over the tofu and vegetables, tossing for 1 minute until the sauce thickens and coats the ingredients.
Garnish with sesame seeds and serve immediately while the tofu is at its crispiest.