Cut the napa cabbage into bite-sized pieces.
Tear the oyster mushrooms into manageable sizes.
Blanch the napa cabbage and mushrooms briefly in boiling water, then rinse in cold water and squeeze out the excess moisture.
In a bowl, mix the blanched napa cabbage and mushrooms with soybean paste, minced garlic, sesame oil, and crushed sesame seeds until well combined.
Transfer to a plate to finish.