tablespoons olive oil
medium yellow onions, halved and cut into 1/4-inch-thick slices
red bell pepper, cored and cut into 1/4-inch-thick slices
green bell pepper, cored and cut into 1/4-inch-thick slices
garlic cloves, sliced
(14-ounce) can tomato sauce
fresh thyme sprigs
teaspoons distilled white vinegar
teaspoons seasoning salt, such as Creole seasoning or Lawry’s
Kosher salt and ground black pepper
- Prepare the sauce: In a large skillet, heat the olive oil over medium until shimmering. Add the onions, red and green bell peppers and garlic, and cook, stirring occasionally, until fragrant and just starting to brown, about 7 minutes.
- Stir in the tomato sauce, thyme and 1 3/4 cups water; bring to a boil over high.
- Stir in the white vinegar and seasoning salt, reduce the temperature to medium-low and simmer for 10 minutes. Season to taste with salt and pepper. Cover and keep warm.
- Meanwhile, prepare the fish: Heat the vegetable oil in a large frying pan over medium. On a large plate, mix the flour and seasoning salt with a fork.
- Pat the snapper fillets dry using paper towels, and season 2 fillets with salt and pepper before dipping them into the flour mixture until coated on both sides.
- Once the oil is shimmering, gently lay the floured fillets in the hot oil, skin-side down, and cook until skin is crispy, 3 to 4 minutes. Using a fish spatula, carefully flip fillets and cook for an additional 2 to 3 minutes, until cooked through.
- Transfer the fish to a large paper-towel-lined plate. Cover loosely with foil and repeat with the remaining fillets.
- Divide fish among plates, skin side up, and top with the Creole sauce. Serve immediately, passing hot sauce at the table.