Prepare the Marinade:

1. Whisk Together Marinade Ingredients: In a small bowl, combine the soy sauce, brown sugar, rice vinegar, sesame oil, minced garlic, and grated ginger (if using). Whisk until the brown sugar has dissolved completely and the mixture is smooth. Taste and adjust the sweetness or saltiness by adding more sugar or soy sauce, depending on your preference.

Marinate the Salmon:

2. Marinate the Salmon Fillets: Place the salmon fillets in a shallow dish or a resealable plastic bag. Pour the marinade over the salmon, ensuring each fillet is well coated. Let the salmon marinate for at least 10 minutes, or up to 30 minutes for a more intense flavor. If you have time, marinate it in the refrigerator to allow the flavors to penetrate the fish.

Cook the Salmon:

3. Heat the Pan: Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Once the oil is hot and shimmering, add the salmon fillets, skin-side down (if they have skin). Let the salmon cook for 4-5 minutes until the skin is crispy and golden.
4. Flip the Salmon: Carefully flip the salmon fillets over and cook for an additional 3-4 minutes, or until the salmon is cooked to your desired doneness. The salmon should be opaque in the center but still moist and tender.

Glaze the Salmon:

5. Add the Marinade: While the salmon is cooking, pour any remaining marinade into the pan. Let it simmer for 1-2 minutes, allowing the sauce to thicken slightly. Spoon the sauce over the salmon fillets as they cook, ensuring they are glazed with the flavorful sauce.
6. Garnish and Serve: Once the salmon is cooked, remove it from the skillet and place it on a serving plate. If desired, sprinkle sesame seeds and chopped green onions over the top for a burst of color and extra flavor. Serve immediately with your favorite side dishes, such as steamed vegetables, rice, or a simple salad.