For the miso paste, often chefs in Japanese restaurants and izakayas ... Roast at 200°C for 15-20 minutes. While the eggplant is roasting, mix the white miso, sugar and mirin in a small bowl ...
To ensure that the glaze doesn’t cover up the delicate flavor of the eggplant, I recommend using the white variety. It’s easily found in mainstream grocery stores as well as Asian markets.