In a shallow dish or a baking dish whisk together the soy sauce, maple syrup, sesame oil, ginger, garlic and the pepper flakes. Add salmon to the dish and turn it around to get the glaze all over. Cover with plastic wrap and let marinate for at least an hour.
Grill the salmon on both sides, until salmon is cooked through or to your liking. I left mine about 4 minutes per side. As you're grilling the salmon, brush with remaining glaze on each side.
Serve garnished with some green onions and sesame seeds, with a side of vegetables or salad.
Total time does not include time for marinating the salmon.
Grilled salmon steaks will last up to 3 days properly stored, in the fridge. Make sure to get it into the fridge within 2 hours of cooking. You can also freeze it, which will actually extend it's shelf life. Wrap your salmon in aluminum foil and then place in freezer bags, you can then freeze it for 2 - 3 months.
Please keep in mind that nutritional information is a rough estimate and can vary greatly based on products used.