Begin by pressing the extra firm tofu for at least 15 minutes to remove excess moisture, then cut it into 1-inch cubes.
In a small glass bowl, whisk together the tamari, minced fresh ginger, grated garlic, rice vinegar, 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 in a single layer and sear for 3-4 minutes per side until they are golden brown and crispy on all edges.
Add the broccoli florets, sliced red bell pepper, and shelled edamame to the skillet with the tofu.
Stir-fry the vegetables for 5-6 minutes until the broccoli is tender-bright green and the peppers are slightly softened.
Pour the prepared sauce over the tofu and vegetable mixture, tossing continuously for 1-2 minutes until the sauce has thickened and coated everything evenly.
Remove from heat and garnish with sesame seeds before serving immediately in a shallow bowl.