Prepare the Eggplant: Cut the eggplants in half lengthwise. Then, make diagonal slits and cut each half in two, so you end up with quarters.
Fry the Eggplant: Heat oil in a frying pan over medium heat. Place the eggplant pieces skin-side down and fry until soft on all sides.
Make the Soup: While cooking the eggplant, combine soy sauce, mirin, dashi powder, water, and grated ginger in a small saucepan. Bring to a gentle boil, then turn off the heat.
Soak the Eggplant: Place the fried eggplant in a container or dish. Pour the warm dashi soup over it and let it soak for about 10 minutes.
Serve: Garnish with chopped scallion and enjoy!
Notes
Making shallow diagonal cuts on the skin helps it cook more evenly and absorb more of the soup.
It tastes even better after resting in the fridge for a couple of hours or overnight.
Shishito peppers, zucchini, bell peppers, and okra also work well—just fry and soak them with the eggplant.