Cut off the base of the enoki mushrooms and rinse them thoroughly under running water.
Julienne the onion and carrot.
Heat cooking oil in a pan over medium heat.
Add the onion and carrot, stir-fry for 1 minute.
Add the enoki mushrooms and season with salt and pepper.
Stir-fry everything lightly for 2–3 minutes.
Transfer to a plate and serve.