Press the extra-firm tofu for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
In a small 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 cubes to the skillet and sear for 8-10 minutes, turning occasionally until all sides are golden and crispy.
Toss in the broccoli florets, sliced red bell pepper, sugar snap peas, and shelled edamame.
Stir-fry the vegetables with the tofu for 5-6 minutes until the vegetables are tender-crisp and vibrant.
Pour the sauce over the mixture and toss well for 1-2 minutes until the sauce thickens slightly and coats every piece.
Remove from heat and garnish with sesame seeds before serving hot.