Cut the eggplant and onion into bite-sized pieces.
Heat oil in a preheated pan.
Add the onion and sauté until translucent, then add the eggplant and cook together.
Add soybean paste, minced garlic, and water, then simmer over low heat.
Taste and adjust seasoning with salt and pepper if needed.
Serve the braised eggplant soy-stir fry over rice to finish.