Drain and press the extra firm tofu for 20 minutes to remove excess moisture.
Cut the tofu into 4 thick rectangular blocks.
Heat the sesame oil in a non-stick pan over medium-high heat and sear the tofu blocks on all sides until golden and crisp.
Use a small spoon to carefully scoop out a rectangular well in the center of each tofu block, leaving the bottom and sides intact.
Finely dice the scooped-out tofu and place it in a mixing bowl.
Add the shelled edamame, diced English cucumber, Greek yogurt, sriracha, rice vinegar, garlic powder, and ground ginger to the bowl.
Stir the filling mixture until well combined and creamy.
Spoon the filling generously into the hollowed tofu boats.
Cut the nori sheet into thin strips and place them over the boats.
Drizzle with tamari and sprinkle with hemp seeds before serving.