Halve 4 to 5 Japanese eggplants lengthwise and crosswise. Brush with vegetable oil. Place flesh-side down on a foil-lined baking sheet; bake at 400˚ F until tender, 15 minutes. Whisk 2 tablespoons each soy sauce, gochujang (Korean red chile paste) and honey, 1 teaspoon each toasted sesame oil and minced garlic, and 1/2 teaspoon kosher salt. Brush glaze on the eggplants; broil until charred, 4 minutes. Brush with the remaining glaze; top with sliced scallions and sesame seeds.