Halve 2 to 3 Japanese eggplants lengthwise and crosswise. Brush both sides with 2 tablespoons olive oil. Place skin-side down on a foil-lined baking sheet. Roast at 400 degrees F until tender, about 15 minutes. Whisk 2 tablespoons each white miso paste and honey and 1 teaspoon sesame oil. Flip the eggplant, brush with the glaze and broil until lightly charred, about 4 minutes. Top with sliced scallions and cilantro.