Prepare the marinade: In a small bowl, whisk together the miso paste, soy sauce, honey, rice vinegar, sesame oil, grated ginger, and minced garlic until smooth.
Marinate the salmon: Place the salmon fillets in a shallow dish or a zip-lock bag. Pour the marinade over the salmon and gently massage it into the fillets. Let the salmon marinate for at least 10-15 minutes (or up to 30 minutes for a deeper flavor).
Preheat the broiler: Preheat your oven's broiler on high. Line a baking sheet with foil or parchment paper for easy cleanup.
Broil the salmon: Place the marinated salmon fillets skin-side down on the baking sheet. Broil for about 8-10 minutes, or until the salmon is golden brown on top and flakes easily with a fork. Watch carefully to avoid burning.
Garnish and serve: Sprinkle sesame seeds over the salmon and garnish with fresh cilantro or green onions, if desired. Serve the salmon with steamed rice and vegetables for a complete meal.