In a medium bowl, whisk together the miso paste, sake, mirin, honey, sesame oil and ginger. Place the salmon fillets in a shallow dish and pour the marinade over them.
Cover and refrigerate for at least 30 minutes. Preheat an outdoor grill for medium-high heat.
Oil the grill grate. Place the salmon fillets on the preheated grill and cook for 5 minutes. Turn over, brush with remaining marinade and cook for an additional 5 minutes or until cooked through.