Cut the eggplant, onion, and green onion into bite-sized pieces.
Heat some cooking oil in a pan and sauté the minced garlic.
Add the onion and green onion and stir-fry.
Add the eggplant and season with salt and pepper.
Add soy sauce, sugar, and mirin, then stir-fry together.
Place the cooked eggplant mixture on top of rice.
Sprinkle sesame seeds and drizzle olive oil on top as desired to finish.