# Cod with Lemon Caper Sauce

Cod with lemon caper sauce is a light but satisfying dinner. The fish gets a golden crust and flakes into big, mild pieces, while the sauce adds tang, salt and richness in just a few minutes.

Think of it as a fish version of chicken piccata. It cooks in one pan in about 25 minutes, and the sauce works on almost any white fish.

- Total time: 22 min (prep 10 min, cook 12 min)
- Serves: 4
- Per serving (estimated): 320 kcal, 34 g protein
- Cuisine: Mediterranean. Category: Main course. Diet: high-protein, low-carb.

## Ingredients

- 4 cod fillets (about 170 g each)
- 1/2 tsp kosher salt
- 1/4 tsp black pepper
- 2 tbsp all-purpose flour
- 1 tbsp olive oil
- 3 tbsp butter
- 2 cloves garlic, minced
- 1/3 cup dry white wine or chicken broth
- 2 tbsp capers, drained
- 2 tbsp lemon juice
- 1 tbsp fresh parsley, chopped

## Method

1. Pat the cod dry. Season with salt and pepper and dust lightly with flour, shaking off the excess.
2. Heat the oil and 1 tablespoon of butter in a 12 inch (30 cm) skillet over medium-high heat until the butter foams.
3. Lay the fillets in the pan. Cook 4 minutes without moving, until the bottoms are golden and the sides turn opaque halfway up.
4. Flip and cook 3 to 4 minutes more, until the cod flakes and reaches 145°F (63°C). Move to a plate.
5. Lower the heat to medium. Add the garlic and cook 20 seconds, until fragrant.
6. Pour in the wine and scrape up the browned bits. Simmer 2 minutes, until reduced by half.
7. Add the capers and lemon juice. Swirl in the remaining 2 tablespoons of butter off the heat until the sauce is glossy.
8. Spoon the sauce over the fish and scatter with parsley.

## Why it works

- A thin flour coat browns in the pan and helps the delicate cod hold together when flipped.
- Searing in butter and oil gives the crust flavor while keeping the heat high enough to brown.
- Deglazing with wine dissolves the browned bits so the sauce tastes of the fish and pan.
- Capers add salty, briny pops that sharpen the flavor of the buttery sauce.
- Swirling in cold butter off the heat thickens the sauce and gives it a glossy finish.

## The science

- **Thick fillets, gentle cooking.** Cod is lean with large flakes that fall apart easily once heated to about 140°F (60°C). A medium-high sear browns the outside while the thick center cooks gently. Pull it at 145°F (63°C) and the flakes stay moist.
- **Mounting with butter.** Whisking cold butter into a warm liquid builds a creamy emulsion of fat in water. The milk solids in butter help hold it together. Keep the pan off direct heat, or the butter melts and separates.
- **Acid and capers.** Lemon juice adds sourness, and capers add both salt and a sharp, mustardy tang. Together they cut the richness of the butter, so the dish tastes bright instead of heavy. The brine from the capers also seasons the sauce, so you rarely need extra salt.

## Tips

- Pick thick center-cut fillets, since thin tail pieces dry out.
- Rinse the capers if you find them too salty.
- Add the cold butter off the heat so the sauce stays creamy.

## Mistakes to avoid

- Moving the cod before it releases tears the fillet, so wait for a golden crust.
- Boiling the sauce after adding the butter makes it greasy, so keep it off the heat.
- Overcooking dries the fish, so remove it at 145°F (63°C) or as soon as it flakes.

## Variations and swaps

- Add halved cherry tomatoes and olives for a Mediterranean style.
- Bake the fish at 400°F (200°C) for 12 minutes and spoon the sauce over it.
- Stir in a spoonful of Dijon for a sharper sauce.
- Swap cod for halibut, haddock or tilapia.
- Swap the wine for extra broth and a splash of lemon juice.
- Swap the butter for olive oil to make it dairy free, though the sauce will be thinner.

## Storage

Refrigerate within 2 hours for up to 3 days. Reheat gently in a covered pan over low heat until it reaches 165°F (74°C), adding a splash of water to loosen the sauce.

## FAQ

**How long do you cook cod in a pan?**

Cook cod fillets about 4 minutes on the first side and 3 to 4 minutes on the second side over medium-high heat. They are done at 145°F (63°C) when opaque and flaky.

**How do I keep cod from falling apart?**

Pat it dry, dust it lightly with flour, use a hot well-oiled pan and flip once with a wide, thin spatula. Do not move it until it releases from the pan.

**What is a good substitute for capers?**

Chopped green olives or chopped cornichons add a similar briny bite. Use about the same amount and reduce added salt.

**Can I bake cod instead?**

Yes. Bake at 400°F (200°C) for 10 to 14 minutes, depending on thickness, then spoon on the sauce made in a skillet.

**Can I use frozen cod?**

Yes. Thaw it overnight in the fridge and pat it very dry. Frozen cod works just as well as fresh and often has better quality than fish thawed at the counter.

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Source: https://cookingscientist.com/recipes/cod-lemon-caper-sauce (Cooking Scientist). Learn the science of cooking in the Cooking Scientist app for iPhone and iPad: https://apps.apple.com/app/id6830326846