Broiled Flounder Recipe: Buttery Lemon Garlic Fillets in 20 Minutes

This broiled flounder delivers restaurant-quality results with minimal effort. The high-heat method creates a perfectly crisp exterior while keeping the fish tender and moist inside.

I’ve perfected this technique using a simple butter, lemon, and garlic combination that enhances the flounder’s delicate flavor. The fillets cook in just 8-10 minutes under the broiler, making it ideal for busy weeknights.

What emerges is flaky, buttery flounder with a golden crust and bright citrus notes. The quick prep means you can have this elegant dish on the table in 20 minutes or less.

Serve with steamed asparagus or a fresh salad for a complete, light meal that feels special without the fuss.

Ingredients for Broiled Flounder

Fresh flounder, bright citrus, and aromatic butter create this elegant seafood dish with minimal effort.

The flounder is the centerpiece. Wild-caught from a trusted seafood counter is ideal—look for fillets that are translucent, not dull, with a mild ocean scent. Whole Foods or a local fishmonger typically have the freshest options. Thickness matters: aim for uniform 1/2-inch fillets so they cook evenly under the broiler. If buying frozen, thaw overnight in the fridge (never at room temperature).

No fresh lemon? Bottled juice in a pinch (but fresh is brighter). Skip the garlic? 1/2 tsp garlic powder works, though fresh gives better flavor. For a richer depth, swap half the butter for ghee. The white wine is optional but adds complexity—substitute chicken broth or more lemon juice if avoiding alcohol. Paprika can be omitted, but it adds a nice color contrast.

Broil immediately after seasoning to prevent the salt from drawing out moisture. Leftovers? Rare with this dish, but store in an airtight container for up to 2 days. Reheat gently in a skillet—microwaving can make the fish rubbery. Best served fresh, straight from the broiler.

Step-by-Step Instructions for Broiled Flounder

Here’s the method. Straightforward, tested, works every time.

Step 1: Prep the Broiler and Season the Fillets

Position the top oven rack 6 inches from the broiler element and preheat the broiler on high. Brush a broiler pan with the 1 tbsp olive oil to prevent sticking. This high-heat setup ensures the fillets cook quickly while developing a beautiful golden crust.

Pat the 1.5 lb flounder fillets dry with paper towels—moisture prevents proper browning. Season both sides evenly with ½ tsp Diamond Crystal kosher salt, ¼ tsp freshly ground black pepper, and the ¼ tsp paprika for a subtle smoky note. The paprika also adds a touch of color that complements the lemon butter sauce.

Step 2: Broil the Fillets to Perfection

Arrange the seasoned fillets on the prepared broiler pan in a single layer, ensuring they don’t overlap. Broil for 4-5 minutes until the tops are lightly golden and the edges begin to crisp. Watch closely—the high heat means they can overcook quickly.

Carefully flip the fillets using a thin spatula, then broil for an additional 3-4 minutes until the fish flakes easily with a fork and reaches an internal temperature of 145°F. The flounder is done when it turns opaque and separates cleanly along the natural segments.

Step 3: Create the Lemon Garlic Butter Sauce

While the fillets broil, melt 4 tbsp unsalted butter in a small saucepan over medium-low heat. Add the 4 cloves minced garlic cloves and sauté for 30-45 seconds until fragrant but not browned—burnt garlic turns bitter.

Stir in the ¼ cup fresh lemon juice, 1 tbsp lemon zest, and the remaining ¼ tsp Diamond Crystal kosher salt and ¼ tsp freshly ground black pepper. Simmer for 1-2 minutes until the sauce slightly thickens. Remove from heat and stir in the remaining 2 tbsp unsalted butter until fully melted and emulsified.

Step 4: Finish and Garnish for Serving

Transfer the broiled fillets to a serving platter. Pour the lemon garlic butter sauce over the top, allowing it to pool slightly around the edges. For an extra layer of flavor, deglaze the broiler pan with the 2 tbsp dry white wine over medium heat, scraping up any browned bits, then drizzle this over the fillets.

Garnish with the ¼ cup chopped fresh parsley and serve immediately with the 4 pieces lemon wedges on the side. The parsley adds a fresh, vibrant contrast to the rich butter sauce, while the lemon wedges allow guests to add extra brightness to their taste.

Flavor Customization for These Flavors

Herb-Infused Butter

Swap plain butter for herb-infused butter—mix 6 tbsp softened butter with 1 tbsp chopped fresh dill or tarragon. The delicate herbs complement the flounder’s mild flavor beautifully. I often add 1 tsp capers for a briny kick. 💛

Spicy Lemon Twist

Add ½ tsp red pepper flakes to the lemon garlic sauce for a subtle heat. The spice cuts through the richness of the butter. For more intensity, include 1 tsp sriracha or 1 tbsp chopped jalapeño to the sauce.

Mediterranean Style

Stir ¼ cup chopped Kalamata olives and 1 tbsp chopped sun-dried tomatoes into the sauce. The salty olives and sweet tomatoes create a bold contrast. I like to finish with a sprinkle of crumbled feta.

Citrus Variation

Replace half the lemon juice with orange juice and add 1 tsp orange zest for a sweeter, more complex citrus profile. The orange adds a vibrant twist that pairs well with the buttery richness.

Creamy Garlic Sauce

For a richer finish, whisk 2 tbsp heavy cream into the lemon garlic butter sauce. The cream mellows the acidity and adds a luxurious texture. Garnish with chopped chives for a pop of color.

Asian-Inspired Glaze

Swap the lemon for 3 tbsp soy sauce, 1 tbsp honey, and 1 tsp grated ginger. Simmer until slightly thickened, then brush over the fillets during the last 2 minutes of broiling. 🌟

Frequently Asked Questions