Season the salmon fillets with salt and pepper on both sides.
In a small bowl, whisk together soy sauce, fish sauce, honey or brown sugar, rice vinegar, sesame oil, minced garlic, and grated ginger to make the marinade.
Place the salmon fillets in a shallow dish or resealable plastic bag and pour the marinade over them. Make sure the salmon is evenly coated. Let it marinate for at least 15-30 minutes in the refrigerator.
Heat olive oil in a large pan over medium-high heat.
Once the oil is hot, carefully place the salmon fillets in the pan, skin side down. Reserve the marinade for later use.
Cook the salmon for about 4-5 minutes on each side, depending on the thickness of the fillets, or until the salmon is cooked through and flakes easily with a fork.
While cooking, you can baste the salmon with the reserved marinade to enhance flavor.
Once the salmon is cooked, remove it from the pan and transfer to a serving plate.
Drizzle any remaining marinade from the pan over the salmon.
Garnish with sesame seeds, sliced green onions, and chopped cilantro if desired.