Prepare Eggplant: Slice the eggplants into 1cm-thick pieces, make scores on them, and sprinkle salt to taste.
Prepare Onions: Julienne the onion and cut the green onions into pieces.
Mix Sauce Ingredients: In a bowl, mix minced garlic, doenjang, soy sauce, Korean cooking wine, unrefined sugar, perilla oil, pepper, and ginger powder if using.
Roast Eggplant: Roast the eggplant pieces in a heated pan with oil until fully cooked.
Stir-fry Onions and Sauce: In the same pan, stir-fry the onion and green onion, add the mixed sauce ingredients, and braise them with the kelp stock and water.
Serve: Ladle the deopbap sauce over the rice, place the roasted eggplant pieces on top, and sprinkle some sesame seeds and green onion pieces.