Step-by-Step Instructions

1. 1.Prepare the Fish

   Ensure the whole tilapia is thawed, gutted, and scaled. Carefully split the fish down the middle along the spine using a sharp knife. You can split it completely into two halves to fit your baking pan.

2. 2.Prepare the Pan and Add Butter

   Line a baking pan with aluminum foil for easier cleanup. Place the split fish halves onto the foil-lined pan. Cut 4 tablespoons (half a stick) of unsalted butter into cubes and place two cubes of butter on each fish half, distributing them over the meat.

3. 3.Dice Tomatoes and Onions

   Wash and dice two small tomatoes. Sprinkle the diced tomatoes evenly over the fish halves. Next, cut half a white onion, peel the skin, and dice it. Sprinkle the diced onion over the fish halves.

4. 4.Season the Fish

   Squeeze the juice from both halves of one lime over the fish. Season one fish half with a pinch of salt and black pepper to taste. Season the other fish half with your preferred fish seasoning (e.g., Fisherman's Wharf or Old Bay) to taste.

5. 5.Bake the Fish

   Preheat your oven to 400°F (200°C). Place the baking pan with the fish into the preheated oven and bake for 15 minutes.

6. 6.Check for Doneness and Continue Baking

   After 15 minutes, carefully remove the pan from the oven. Use a fork to gently flake the thickest part of the fish meat. If it's still pink or doesn't flake easily, return it to the oven for another 15 minutes (for a total of 30 minutes baking time).

7. 7.Serve

   Once the fish is cooked through and flakes easily, remove it from the oven. Carefully scoop the meat from the fish halves onto a plate, being mindful of any remaining bones. Garnish with fresh lime slices or jalapeños if desired.