Steamed edamame are sprinkled with gomashio, a blend of salt and toasted sesame seeds that can be made at home in a spice grinder.
Coarsely grind sesame seeds and salt in a spice grinder, then place in a small bowl. (Alternatively, chop sesame seeds and salt together finely.)
Fill a large pot fitted with a steamer insert or basket with 2 to 3 inches water. Bring water to a simmer over medium-high heat. Steam edamame, covered, until hot, 3 to 4 minutes. Transfer to a bowl, and sprinkle with sesame-salt mixture. Serve immediately.