Whisk the miso, butter, sake, mirin, and sugar in a small bowl and set it aside.
Line the salmon fillets onto a paper towel and pat them dry to remove excess moisture. Generously season them with salt and black pepper.
Warm olive oil in a large skillet or saute pan over medium-high heat. Once the pan is hot, place salmon, skin-side-down, into the hot pan and cook for 2 minutes. Flip, and cook for another minute. Remove the salmon fillets and set them aside.
Add the cabbage, onions, carrots, mushrooms, and garlic to the saute pan. Cook until slightly wilted, and remove the vegetables from heat.
Set the reserved fillets onto the wilted vegetables, and spoon the miso butter over the salmon and around the vegetables. Cover the pan with a lid and simmer for 5-8 minutes over medium heat.
Garnish with thinly sliced green scallions to serve.
Notes
Expert Tips:
Use butter softened at room temperature (not melted) so the butter combines with the miso for a smooth and creamy sauce.
Saute the vegetables until they wilt, but no more than that. Cooking the vegetables for too long before adding the salmon will cause them to become mushy.
Slather miso butter on top of salmon fillets and vegetables for additional flavor, allowing the fat to render and baste the fish and vegetables.
Sear the skin-on salmon in the pan to create the perfect texture for the skin once it steams. Feel free to skip this step and steam the salmon for skinless salmon fillets.
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.