Press the 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, minced fresh ginger, and minced garlic 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 to 10 minutes, turning occasionally until all sides are golden brown and crisp.
Toss in the shredded green cabbage and shelled edamame, sautéing for 3 to 4 minutes until the cabbage is slightly wilted but retains a crunch.
Pour the ginger-garlic sauce over the tofu and vegetables, stirring well to coat everything evenly.
Cook for an additional 1 to 2 minutes until the sauce has thickened slightly and the flavors have melded.
Season with sea salt and black pepper then remove from heat.
Garnish the stir-fry with hemp seeds and sliced green onions before serving immediately.