Salmon fillets should be taken out of the fridge and left to warm up. Set the grill to 450 degrees.
In a small saucepan, combine the maple syrup, balsamic vinegar, ginger, garlicand crushed red pepper flakes while the grill is getting ready. Heat to a boil over medium.
Heat down to medium-low and keep cooking until sauce is reduced by one-third (it will have thickened slightly and will coat the back of a spoon).Remove from heat, season with salt and pepper to taste, and divide evenly between two bowls: One for dishing and one for basting the grilled fish.
With paper towels, completely pat dry the salmon fillets. Avocado oil should be liberally applied on the salmon's two sides.A pair of tongs,rub the grill grates with a paper towel that has been dipped in avocado oil. Salmon fillets should be placed on oiled grates skin side up. Reduce the heat to medium-low and cook the fish for 2 minutes, or until it easily slides off the grill.
After turning the fish over, brush the fillets with half of the basting sauce.Grill cover off for a minute.Cook for a further 30 to 60 seconds after basting once more with the leftover sauce.Once done, check the fish and remove it from the grill. Serve with any remaining sauce.