How to Make It
Heat a large skillet over medium heat. Add the oil, then add the onions and ginger. Cook until the onions are soft, about 2 minutes.
Stir in the mushrooms and cook for 2 minutes, or until mushrooms are soft.
Add the edamame, soy sauce, sake, and sesame seed oil. Stirring occasionally, cook for another 2 minutes, or until the edamame is heated through. Season with black pepper. Serve warm.