Branzino Mediterranean

Preheat the oven to 325 degrees F (165 degrees C).

Drizzle 1 tablespoon olive oil into a large baking pan; add red onion and season with salt and pepper.

Place 2 whole branzino fish into the baking pan. Stuff each cavity with 1 lemon wedge, 1 rosemary sprig, and some of the red onion in the pan. Pour white wine and lemon juice over fish and sprinkle with oregano. Drizzle remaining 1 tablespoon olive oil over fish.