Equipment
Ingredients
Roasted Cod
- 600 g cod fillets, skinless, divided into 4 portions
- 15 ml olive oil
- 4 g salt
- 2 g black pepper, freshly ground
Tangy Tangerine Sauce
- 240 ml tangerine juice, freshly squeezed
- 3 g tangerine zest, finely grated
- 1 shallot, minced
- 15 ml white wine vinegar
- 10 g honey
- 30 g unsalted butter, cold, cut into small cubes
- salt
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 251 kcal
- Protein
- 27 g
- Carbohydrates
- 10 g
- Fat
- 11 g
- Fiber
- 1 g
- Sugar
- 9 g
- Sodium
- 569 mg
- Saturated Fat
- 5 g
- Monounsaturated Fat
- 5 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 81 mg
- Potassium
- 763 mg
- Calcium
- 43 mg
- Iron
- 0.9 mg
- Magnesium
- 56 mg
- Phosphorus
- 320 mg
- Zinc
- 0.7 mg
- Vitamin A
- 77 mcg
- Vitamin C
- 21 mg
- Vitamin D
- 1.4 mcg
- Vitamin E
- 1.8 mg
- Vitamin K
- 4 mcg
- Vitamin B6
- 0.4 mg
- Vitamin B12
- 1.4 mcg
- Thiamin
- 0.16 mg
- Riboflavin
- 0.12 mg
- Niacin
- 3.2 mg
- Folate
- 17 mcg
- Water
- 187 g
Sources: USDA FoodData Central
Method
Preheat the oven to 200C/400F. Line a baking sheet with parchment paper.
Thoroughly pat the cod fillets dry with paper towels to remove excess surface moisture.
Place the cod fillets on the prepared baking sheet. Coat evenly with olive oil, salt, and black pepper. Let rest at room temperature while preparing the sauce base.
In a small saucepan, combine the fresh tangerine juice, tangerine zest, minced shallot, white wine vinegar, and honey.
Place the saucepan over medium-high heat and bring to a steady simmer. Cook until the liquid has reduced by two-thirds and thickens to a syrupy consistency, about 10 to 12 minutes.
While the sauce reduces, transfer the baking sheet with the cod to the preheated oven. Roast until the fish is entirely opaque and flakes easily when pressed with a fork. The internal temperature must reach 63C/145F.
Remove the reduced tangerine sauce from the heat. Gradually add the cold butter cubes one at a time, whisking constantly until the butter is fully melted and the sauce is glossy and emulsified. Season to taste with salt.
Transfer the roasted cod to warm serving plates. Spoon the warm, tangy tangerine glaze generously over each fillet. Serve immediately.
Chef's Notes
- Always pat the fish incredibly dry before seasoning. Surface moisture prevents proper heat transfer and can result in steaming rather than roasting.
- Swirling cold butter into a hot reduction off the heat creates a classic 'beurre blanc' style emulsion that provides a luxurious mouthfeel without being overly heavy.
- Fresh tangerine juice is crucial here. Bottled citrus juices are pasteurized and often develop a metallic or bitter off-taste when reduced over heat.
- Depending on the natural sweetness of your tangerines, you may need an extra splash of white wine vinegar at the end to properly balance the acidity.
Storage
Refrigerator: 2 days — Store fish and sauce in separate airtight containers.
Reheating: Reheat fish gently in a 135C oven. Warm the sauce in a saucepan over very low heat, whisking constantly.
Troubleshooting
Sauce is too thin and watery after adding butter.
Cause: The tangerine juice mixture was not reduced enough before finishing.
Fix: Return the pan to very low heat and whisk constantly until it tightens up. Do not let it boil vigorously or the butter will separate.
Prevention: Ensure the juice reduces to at least one-third of its original volume before taking it off the heat.
Sauce looks oily, separated, or broken.
Cause: The pan was too hot or the butter was too warm when added.
Fix: Add a splash of cold water or a tiny amount of cold cream and whisk vigorously to bring the emulsion back together.
Prevention: Always remove the pan from the heat completely and use ice-cold butter for the emulsion.
Fish is dry and rubbery.
Cause: Overcooking in the oven.
Fix: Cannot be fixed, but the rich buttery sauce will help add moisture back to the bite.
Prevention: Check the fish 3 to 4 minutes before the estimated finish time. Pull it out exactly when it reaches 63C/145F.
Cultural Context
Citrus-based pan sauces and reductions are a hallmark of classic French seafood cookery, heavily adapted in modern American coastal cuisine. The pairing of a mild white fish with an acidic, sweet tangerine glaze cuts through the richness of the buttery finish while enhancing the delicate flavor of the catch without overpowering it.
