In a small bowl, whisk together the sake and miso until no lumps remain. Set aside.
In a 12-inch nonstick skillet over medium, melt the butter.
Add the corn and scallion whites, then cook, stirring often, until the corn begins to brown, about 5 minutes.
Add the ginger and cook, stirring, just until fragrant, about 30 seconds.
Stir in the miso mixture and the scallion greens.
Off heat, taste and season with pepper.