Bring a small pot of water to a boil and add the edamame. Cook until tender, about 5 minutes. Drain well and cool slightly.
Place the edamame in a food processor along with the miso, 1/2 cup water, garlic, ginger, sesame oil and 2 tablespoons rice vinegar. Set aside 1 tablespoon scallion for garnish and add the rest to the food processor. Process until smooth, scraping down the sides of the bowl as needed. Season with the additional tablespoon of rice vinegar if desired.
Transfer the dip to a small serving bowl and garnish with the reserved scallions and the sesame seeds if using. Serve with crackers and vegetables for dipping.
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