How to Make It
Heat grill to medium. Once it is hot, clean the grill grate with a wire brush. Just before grilling, oil the grill grate.
Soak 8 skewers in water for at least 15 minutes.
Combine the miso paste, vinegar, sugar, ginger, and soy sauce in a medium bowl. Add the mushrooms and toss to combine. Thread onto the skewers and grill, turning occasionally, until tender, 8 to 10 minutes. Sprinkle with the sesame seeds and chives.