Method

In a small microwave safe bowl, microwave butter until very softened, almost melted. Stir in garlic, lemon zest, salt, and red pepper flakes. Spoon mixture all over salmon fillets.

Preheat grill to medium-high. Arrange lemons on grill and place salmon fillets on top. Cover grill and cook until salmon is cooked through and flakes easily with a fork, 15 to 20 minutes. (Exact cooking time will vary based on the thickness of your fillets.)

Serve with grilled lemon slices and garnish with parsley, if using.