Cut smoked duck, enoki mushrooms, tofu, onion, and green onion into bite-sized pieces.
Stir-fry the smoked duck in a pan over medium heat first.
When the duck fat renders out, add enoki mushrooms, onion, and tofu, and stir-fry together.
Season with salt and pepper, then add the green onion and stir-fry once more.
When all ingredients are cooked, turn off the heat and it's ready to serve.