Brown Butter Lemon Pan-Seared Flounder

Brown Butter Lemon Pan-Seared Flounder turns delicate fish fillets into a dinner that feels polished but stays wonderfully simple. Each piece gets a feather-light flour and cornstarch coating, then cooks mostly on one side for golden edges and a tender, flaky center. The same skillet becomes a glossy sauce with nutty brown butter, fresh lemon, shallot, garlic, Dijon, and parsley.

Flounder is thin and quick-cooking, so the entire dish comes together in about 25 minutes. Better still, the sauce tastes rich without feeling heavy because lemon keeps every bite bright. This is the kind of weeknight recipe that quietly looks like a special occasion.

Serve it with mashed potatoes, rice, roasted asparagus, or crusty bread for catching the extra sauce. Just keep the plates nearby—once the butter turns golden, dinner moves quickly.

Recipe Yield: 4 servings

INGREDIENTS

4 (4–5-oz) skinless flounder fillets, similar in thickness
3/4 tsp kosher salt, divided
1/4 tsp freshly ground black pepper
1/4 cup all-purpose flour
1 tbsp cornstarch
1/2 tsp garlic powder
1/4 tsp sweet paprika
2 tbsp extra-virgin olive oil, divided
5 tbsp unsalted butter, divided, with 1 tbsp kept cold
1 small shallot, finely minced
2 small garlic cloves, finely minced
2 tbsp low-sodium chicken broth or seafood stock
1 1/2 tbsp fresh lemon juice
1 tsp finely grated lemon zest
1/2 tsp Dijon mustard
2 tbsp chopped fresh flat-leaf parsley
1 lemon, cut into wedges for serving

INSTRUCTIONS

1. Dry and season the fish:
Pat the flounder thoroughly dry. Season both sides with 1/2 tsp salt and the black pepper.

2. Prepare the coating:
Whisk the flour, cornstarch, garlic powder, paprika, and remaining 1/4 tsp salt in a shallow dish. Lightly dredge each fillet just before cooking, then shake off all excess.

3. Sear the first batch:
Heat 1 tbsp olive oil and 1/2 tbsp butter in a large nonstick skillet over medium-high heat. Once shimmering, add two fillets presentation-side down. Cook undisturbed for 2–3 minutes, until deeply golden and nearly opaque.

4. Finish and repeat:
Carefully flip with a thin spatula. Cook for 30–60 seconds, until just opaque and 145°F in the thickest area. Transfer to a warm platter without covering. Carefully remove any dark coating crumbs with a folded paper towel held in tongs. Repeat with the remaining oil, another 1/2 tbsp butter, and remaining fillets.

5. Brown the butter:
Reduce the heat to medium and remove any remaining dark crumbs. Add 3 tbsp butter. Swirl for 2–3 minutes, until the milk solids turn amber and smell toasted and nutty.

6. Build the lemon sauce:
Add the shallot and cook for 30–45 seconds. Stir in the garlic for 15 seconds. Remove the skillet from the heat, then carefully whisk in the broth, lemon juice, lemon zest, and Dijon.

7. Finish the sauce:
Return the skillet to low heat and simmer for 30–60 seconds. Remove from the heat, then whisk in the remaining cold 1 tbsp butter until glossy. Stir in the parsley and taste for seasoning.

8. Serve:
Spoon the brown butter lemon sauce around and lightly over the flounder, leaving some golden edges uncovered. Serve immediately with lemon wedges.

HELPFUL TIPS TO PERFECT THIS RECIPE

• Dredge immediately before cooking: Letting coated flounder sit too long draws moisture into the flour. Coat each fillet shortly before it enters the skillet for the crispest finish.
• Use a nonstick skillet and thin spatula: Flounder is delicate and can split easily. A wide nonstick pan and flexible fish spatula make turning the fillets much safer.
• Cook mainly on the first side: The fish should look almost cooked before flipping. Very thin fillets may need only 30 seconds on the second side.
• Sauce just before serving: Spoon the lemon brown butter sauce over the fish at the table or immediately before serving. This keeps the coating golden instead of soft.