Trim the base of the enoki mushrooms and tear them into bite-sized pieces.
Julienne the onion and slice the green onion.
Heat cooking oil in a pan, add the green onion, and stir-fry until fragrant to make scallion oil.
Add the onion and stir-fry until it becomes translucent.
Add the enoki mushrooms and stir-fry over medium heat.
Add gochujang (Korean chili paste), soy sauce, chili powder, sugar, minced garlic, and water. Mix well.
When all ingredients are well combined, cover the pan and cook for 1-2 minutes.
Turn off the heat and sprinkle sesame oil and sesame seeds.
Serve the stir-fried enoki mushrooms over rice.