Step 1: Prepare the Miso Butter

1. Mix the Ingredients: In a small bowl, combine softened butter, miso paste, soy sauce, rice vinegar, garlic, ginger, and sesame oil. Mix until smooth and well combined.
2. Set Aside: Cover and refrigerate the miso butter until ready to use.

Step 2: Season and Cook the Salmon

Pan-Seared Method

1. Season the Salmon: Pat the salmon fillets dry with paper towels, then season both sides with salt and black pepper.
2. Heat the Pan: Heat olive oil in a large non-stick or cast-iron skillet over medium-high heat.
3. Sear the Salmon: Place the salmon fillets skin-side down in the hot skillet. Cook for 4-5 minutes without moving them, allowing the skin to crisp.
4. Flip and Finish: Carefully flip the fillets and cook for an additional 2-3 minutes, or until the salmon is just cooked through.

Oven-Baked Method

1. Preheat the Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare the Fillets: Place the seasoned salmon fillets on the prepared baking sheet.
3. Bake: Bake for 12-15 minutes, or until the salmon is cooked through and flakes easily with a fork.

Step 3: Add the Miso Butter

1. Top the Salmon: While the salmon is still hot, spread or dollop a generous amount of miso butter over each fillet. The heat from the fish will melt the butter, creating a luscious sauce.

Step 4: Garnish and Serve

1. Garnish: Sprinkle the salmon with sliced green onions, sesame seeds, and a squeeze of fresh lemon juice, if desired.
2. Serve Immediately: Pair with steamed rice, roasted vegetables, or a fresh salad for a complete meal.