Preheat your oven to 400°F.
Slice the eggplant in half lengthwise and score the flesh in a diamond pattern, being careful not to cut through the skin.
Place the eggplant halves on a baking sheet, cut side up.
In a small bowl, whisk together the miso paste, honey (or maple syrup), soy sauce, rice vinegar, sesame oil, ginger, and garlic until smooth.
Brush the miso mixture generously over the cut sides of the eggplant.
Roast the eggplant in the preheated oven for 25-30 minutes, or until the flesh is tender and caramelized.
Halfway through cooking, brush on more of the miso glaze for extra flavor.
Once cooked, remove the eggplant from the oven and sprinkle with sesame seeds and sliced green onions before serving.
Allow to cool slightly before serving.