Prepare the Snapper
Preheat your oven to 400°F (200°C).
Rinse the snapper under cold water and pat it dry with paper towels. Ensure the fish is completely dry to help achieve a crispy skin.
Use a sharp knife to make two or three diagonal slashes on each side of the fish. This allows the seasoning to penetrate and helps the fish cook more evenly.
Season the Fish
Rub the entire fish with olive oil, making sure to coat it well on both sides.
Season the fish inside and out with salt and black pepper.
Stuff the cavity of the fish with a few sprigs of rosemary, minced garlic, and slices from one of the lemons.
Prepare for Baking
Place the seasoned fish on a roasting pan or baking sheet lined with parchment paper or aluminum foil for easy cleanup.
Place the remaining lemon slices on top of the fish, and scatter a few more sprigs of rosemary around it for extra flavor.
Bake the Snapper
Place the snapper in the oven and bake for 25-30 minutes, or until the fish is cooked through and the skin is golden and crispy. The internal temperature of the fish should reach 145°F (63°C) when fully cooked.
Baste the fish with its own juices halfway through cooking to keep it moist and enhance the flavor.
Serve
Remove the fish from the oven and let it rest for a few minutes before serving.
Garnish with fresh parsley, additional lemon wedges, and a drizzle of olive oil if desired.
Serve the snapper whole, allowing guests to enjoy both the crispy skin and tender meat.