Preheat the grill for medium heat (350°F). Arrange two slices of aluminum foil on a baking sheet and fold up the edges to create a tray. Spray the foil with cooking spray.
Arrange half of the lemon slices on the foil in a single layer about the same size as the piece of fish.
Place the salmon on top of the lemon slices and season with salt and pepper.
Spread the pesto over the salmon and top with the remaining lemon slices.
Grill until the salmon is cooked through, 15 to 17 minutes.
Notes
Checking for doneness--To check for doneness, gently prod the center of the salmon with a fork or knife. When it's done, it should flake apart easily.
Transporting the fish--Use a baking sheet or metal tray under the foil when transporting it to and from the grill. The foil can be pretty flimsy.
Make it in the oven--Cook the salmon on a baking sheet in a 350°F oven for 15 to 17 minutes.
Dietary--This pesto-crusted salmon recipe is suitable for gluten-free and dairy-free diets.