1Bring 6 cups water to a rolling boil in a large pot over high heat. Add 3 tablespoons sea salt to create heavily salted water similar to pasta water salinity.
2Add frozen edamame pods directly to the boiling salted water without thawing. Maintain a vigorous boil and cook for 4-5 minutes until pods are bright green and beans inside are tender-crisp, not mushy.
3Toast sesame seeds in a dry skillet over medium heat, shaking frequently, until golden and fragrant, about 2-3 minutes. Set aside.
4Drain edamame thoroughly in a colander, shaking vigorously to remove excess water that would dilute seasonings.
5Transfer warm edamame immediately to a large mixing bowl. Drizzle with toasted sesame oil and soy sauce while still hot. Sprinkle with 1 tablespoon sea salt, garlic powder, and wasabi powder if using. Toss vigorously for 30 seconds to coat every pod evenly.
6Taste one pod and adjust salt as needed, since edamame absorbs seasoning gradually. Transfer to a serving bowl and garnish with toasted sesame seeds.
7Serve immediately while warm for optimal flavor and restaurant-quality presentation. Provide an empty bowl for discarded pods.