Preheat the oven to 400 degrees.
Cut the sea bass fillet(s) into 5-6 ounce portions and place each on a parchment paper lined baking sheet.
Sprinkle with salt and pepper.
Spoon 1-2 tablespoons of pesto on each sea bass portion.
With the back of the spoon, evenly spread the pesto over the fish.
Bake the fish for about 15 minutes (10 minutes per 1 inch thickness) at 400 degrees or until the fish flakes and is cooked through.
While the fish is baking, chop the tomatoes, drizzle with 1 tablespoon of olive oil and sprinkle with salt and pepper.
When the fish is done, garnish with tomatoes and serve immediately. Enjoy!