1. Pat dry the salmon with kitchen paper, and then marinated with soy sauce and mirin for a while.
2. Combine the water, soy sauce and mirin to form a sauce, set aside.
3. Chop the scallion; trim off the root of the enoki mushroom and cut in half.
4. Heat the pan with a little oil; add the salmon, pan fry the salmon on medium heat until cooked, then set aside.
5. Add butter to the hot pan, cook on medium-low heat until it melts, sauté the shimeji mushrooms and enoki mushrooms until fragrant, add scallion, then pour the sauce, cook about one minute, turn off the heat and add the cornstarch water and stir, and then turn on the heat and cooked.
6. Cut the salmon into pieces and transfer to a plate, top with the shimeji mushroom, enoki mushroom and sauce, add scallion. Done.