1. Heat olive oil in a pan, sprinkle with pepper, and sear the thinly sliced eggplant on both sides.
2. Scrape the roe out of the mentaiko, discarding the membrane.
3. In a mixing bowl, combine the grilled eggplant from step 1, chopped scallion, minced garlic, 1T soy sauce, 1T sesame oil, and toasted sesame seeds, mixing gently.
4. Top a bowl of rice with the mentaiko eggplant from step 3 and the egg yolk.