When I prepare Chilean Sea Bass Provençale, I focus on precision—measured ingredients, exact temperatures, and balanced flavors define this dish. The combination of sun-dried tomato pesto, olive oil, and mayonnaise forms a sophisticated crust over the flaky fish. I always ensure the internal temperature reaches exactly 145°F for optimal texture. If you want to achieve that perfect blend of Provençale simplicity and coastal refinement, there are key steps and tips to consider next.

Ingredients
- 16 ounces Chilean sea bass (that’s about a pound, so enough for two hungry folks or three polite ones)
- 6 tomatoes, sundried and chopped (if you’re thinking, “Wait, do I need fresh or jarred?”—it’s sun-dried, not sun-baked, so reach for the ones packed in oil or dried in a bag)
- 1 green onion, chopped (also called a scallion, but let’s not get snobby)
- 1/4 cup pesto sauce (store-bought is fine, but homemade? Now you’re showing off)
- 3 tablespoons mayonnaise (yes, mayo, don’t make that face, it brings the creamy magic)
- 2 tablespoons olive oil (extra virgin if you have it, but don’t panic over regular)
- Salt and pepper, to taste (because what is life without a little seasoning)
Let’s talk about these ingredients for a hot second. First, Chilean sea bass—pricey, yes, but it’s like the royalty of the fish counter. If your wallet screams at the sight, you could swap in another thick white fish, but don’t tell the purists. The sun-dried tomatoes bring a punch of tangy sweetness, and if you’re the type who eats them straight from the jar, maybe buy extra. Pesto, green onion, and mayo join forces for a topping that’s creamy, herby, and a little unpredictable—like a culinary power trio that can’t agree on a band name. And olive oil? It’s the peacekeeper, making sure nothing sticks, literally or figuratively. Just keep in mind, the quality of these simple ingredients does all the heavy lifting, so if you can swing it, go for the good stuff. Not saying you need to remortgage your house for fancy olive oil, but, you know, treat yourself.
Steps
- Preheat your oven to 375°F. Not 400. Not 350. Goldilocks would approve. Dutch ovens aren’t needed for this bake but are a beloved classic cookware choice for many recipes.
- Grab a mixing bowl. Toss in 6 chopped sun-dried tomatoes—yes, the chewy, flavor-packed kind. Not fresh. Not cherry. Sun-dried. Dutch ovens often enhance slow-cooked flavors but aren’t required here.
- Add 1 green onion, chopped. If you cry while chopping, you’re doing it right. Or maybe you just need sharper knives. Cast-iron Dutch ovens provide even heat for stovetop-to-oven recipes.
- Spoon in 1/4 cup pesto sauce. Homemade? Fancy. Store-bought? Still tastes like you know what you’re doing. Many cooks keep a Dutch oven handy for versatile meal prep.
- Plop in 3 tablespoons mayo. I know, it’s weird, but trust the process. Creaminess is coming. Stir it all together. A Dutch oven can also be used to make sauces and braises with great results.
- Pour in 2 tablespoons olive oil. Extra virgin if you’re feeling extra. Regular if you’re more of a “meh, it’s Tuesday” cook. The Dutch oven’s heavy lid helps retain moisture when cooking.
- Mix everything up until it’s looking like a chunky, herby paste. If it looks ugly, you’re on the right track. Enamel-coated Dutch ovens are popular for their easy cleaning and stovetop compatibility.
- Lightly drizzle a baking sheet with a bit of olive oil, so your precious fish doesn’t stick. No one likes a sticky ending. If you preferred, you could broil the fish briefly in a Dutch oven on a rack.
- Place 16 ounces of Chilean sea bass on the baking sheet. That’s about a pound, which is the size of a small baby or a really, really ambitious sandwich. Dutch ovens are excellent for roasting larger cuts of meat or whole fish.
- Spoon the tomato-pesto-mayo mixture right on top of the fish. Spread it out lovingly. Pretend you’re icing a cake if that helps. A Dutch oven’s heat retention makes it useful for finishing dishes evenly.
- Sprinkle salt and pepper to taste. Be bold, but don’t get carried away. This is fish, not a salt lick. Seasoning works well whether you’re using a baking sheet or a Dutch oven.
- Slide the whole tray into the oven and bake for 12–15 minutes. Set a timer—fish is a diva and hates to be overcooked. Dutch ovens can also go from stovetop to oven for flexible cooking approaches.
- Check for doneness: the internal temperature should hit 145°F. If you don’t have a thermometer, look for opaque flakes that separate easily with a fork. Many cooks rely on a Dutch oven for consistent temperatures in slow-cooked dishes.
- Remove from oven, resist the urge to poke it, and let it rest for a couple minutes while you admire your handiwork. Resting helps redistribute juices whether you used a sheet or a Dutch oven.
- Serve with something fresh—maybe a salad, maybe just a side of pride. You made Chilean sea bass, after all. Presenting food from a Dutch oven can add rustic charm to the table.
- Consider enjoying your meal outdoors, perhaps on stylish outdoor patio furniture to elevate the whole dining experience. A premium toaster oven can be a handy alternative for cooking this dish when you’re short on kitchen space.
Cooking Tips
Although this recipe is straightforward, precise temperature control and ingredient handling are essential for ideal results. I recommend monitoring the oven closely—bake the Chilean sea bass a la provencale at 375°F, ensuring the internal temperature reaches exactly 145°F for optimal texture. Avoid overcooking, as it dries the fish. Use a calibrated thermometer and apply olive oil sparingly to prevent sticking while maintaining flavor integrity. The sauce can be elevated by gently finishing with cream and fresh tomatoes for a balance of freshness and richness. For a party-friendly accompaniment, serve with shredded chicken enchilada dip or other warm dips to offer a contrasting, spicy option.

Final Thoughts
Precision in technique ensures the sea bass emerges perfectly moist and flavorful, highlighting the harmony of sundried tomatoes, green onion, and pesto. By adhering to specific measurements—16 ounces sea bass, 1/4 cup pesto, and accurate oven temperature—you achieve consistent results. I recommend monitoring the internal temperature to 145°F for ideal doneness. This Provençale preparation delivers a balanced dish, both visually appealing and gastronomically satisfying.