Grilled Salmon with Caramelized Onions

Olive oil spray (from a spray bottle, not a store-bought, prefilled one that contains propellant; I used a Misto)
2 (4-ounce) skinless salmon fillets, preferably wild-caught
Sea salt and pepper, to taste
⅔ cup Easier-Than-Caramelized Onions (see this page), reheated if necessary

Although salmon is high in fat, it’s good-for-you fat when eaten in moderation.

Preheat a grill to high.
Lightly mist both sides of each salmon fillet with spray. Season with salt and pepper. Lightly mist a large sheet of aluminum foil and place it directly on the grill rack, spray side up. Set the fillets side by side on the foil so they do not touch. Grill them until the salmon is cooked through, 2 to 4 minutes per side.
Transfer each fillet to a plate and top each with half the onions. Serve immediately.