Ensure the grates on the outdoor grill are very clean and preheat to medium.
Season each of the salmon filets with salt then allow them to come to room temperature while the grill is preheating.
Meanwhile, melt the butter in a small saucepan and add garlic. Allow the garlic to cook in the butter for approximately 1 minute until the garlic softens just a bit. Remove the pan from the heat, stir in your choice of herb then allow the garlic herb butter to cool until you are finished grilling the salmon.
Once the grill has preheated, blot any moisture from the surface of the salmon with paper towels. Brush the grates with oil, place the salmon flesh side down on the grill and close the lid of the grill. Allow the salmon to sear on the first side for approximately 2–3 minutes. Usually, the salmon will release itself from sticking to the grill when it is ready to be turned.
Flip the salmon and cook on the remaining side until it is cooked to desired doneness—this will vary depending on the thickness of your salmon filets. Once the salmon flakes when pressed gently, it’s done.
Remove salmon from the grill and brush each filet generously with garlic herb butter. Season with a little coarse salt and fresh cracked pepper then serve with a few lemon wedges for squeezing.
Fish flakes when gently pressed—a sign that it’s done cooking.