Cut the enoki mushrooms, add cooking oil, and stir-fry.
Wash the enoki mushrooms thoroughly and trim off the roots.
Thinly slice the onion.
Heat a pan over medium heat with cooking oil.
Stir-fry the onions first, then add the enoki mushrooms and stir-fry together.
Season with salt and pepper.
Turn off the heat, transfer to a plate, and serve.