Equipment
Ingredients
Fish
- 600 g cod fillets, skinless, cut into 4 equal portions
- 15 ml olive oil
- 4 g kosher salt
- 1 g white pepper, ground
Tangerine Sauce
- 120 ml tangerine juice, freshly squeezed
- 30 g shallot, finely minced
- 15 ml white wine vinegar
- 45 g unsalted butter, cold, cut into small cubes
- 1 g kosher salt
- 2 g tangerine zest, finely grated
Garnish
- 5 g chives, finely chopped
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 257 kcal
- Protein
- 27 g
- Carbohydrates
- 5 g
- Fat
- 14 g
- Fiber
- 0 g
- Sugar
- 4 g
- Sodium
- 569 mg
- Saturated Fat
- 6 g
- Monounsaturated Fat
- 6 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 89 mg
- Potassium
- 706 mg
- Calcium
- 37 mg
- Iron
- 0.8 mg
- Magnesium
- 53 mg
- Phosphorus
- 317 mg
- Zinc
- 0.7 mg
- Vitamin A
- 107 mcg
- Vitamin C
- 12 mg
- Vitamin D
- 1.4 mcg
- Vitamin E
- 1.8 mg
- Vitamin K
- 3 mcg
- Vitamin B6
- 0.4 mg
- Vitamin B12
- 1.4 mcg
- Thiamin
- 0.14 mg
- Riboflavin
- 0.12 mg
- Niacin
- 3.1 mg
- Folate
- 15 mcg
- Water
- 157 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Preheat the oven to 200°C/400°F. Line a baking sheet with parchment paper to prevent sticking and aid in cleanup.
Pat the cod fillets completely dry with paper towels to ensure even roasting and prevent them from steaming in their own moisture.
Rub the dry cod fillets lightly with olive oil, then season all sides evenly with kosher salt and white pepper.
Place the seasoned fish on the prepared baking sheet and roast in the preheated oven for 12 to 15 minutes, or until the internal temperature reaches 63°C/145°F and the flesh flakes easily.
While the fish roasts, combine the freshly squeezed tangerine juice, minced shallot, and white wine vinegar in a small saucepan. Bring the mixture to a boil over medium-high heat.
Lower the heat slightly and let the liquid reduce until only about 30ml of syrupy liquid remains. Watch closely at the end so it does not scorch.
Reduce the heat to the lowest setting. Whisk in the cold cubed butter one piece at a time, moving continuously until the sauce becomes opaque, glossy, and slightly thickened. Remove from heat immediately, then stir in the tangerine zest and remaining salt.
Transfer the roasted cod to warm dinner plates and spoon the warm tangerine sauce generously over the top. Garnish with chopped chives and serve immediately.
Chef's Notes
- For the absolute best texture, season the cod fillets with salt 15 minutes prior to roasting. This draws out excess moisture, resulting in a firmer, meatier flake.
- White pepper is specified here to maintain the pristine white aesthetic of the fish and the uninterrupted vibrance of the orange sauce, avoiding black specks.
- Always assess your tangerines before reducing the sauce. If they are aggressively tart, whisk a tiny pinch of sugar into the reduction; if overly sweet, an extra drop of vinegar at the end will balance it.
- The classical beurre blanc technique requires patience. If you are nervous about breaking the sauce, taking the pan completely off the heat to whisk in the final pieces of cold butter is the safest approach.
Storage
Refrigerator: 2 days — Store sauce and fish in separate airtight containers.
Reheating: Gently reheat fish in a low oven. Sauce may break if boiled; warm gently over a double boiler.
Troubleshooting
The sauce separates and looks oily rather than creamy
Cause: The heat was too high while incorporating the butter, or the butter was too warm before adding.
Fix: Remove from heat immediately, add a splash of cold water or a tiny drop of heavy cream, and whisk vigorously to force the emulsion back together.
Prevention: Keep butter in the refrigerator until the exact moment of use, and maintain low or residual heat when whisking it in.
The fish releases milky white liquid during roasting
Cause: The fish was cooked too aggressively or slightly overcooked, causing albumin to seep out.
Fix: Gently scrape the coagulated proteins away with a spoon before plating. It is purely cosmetic.
Prevention: Ensure accurate oven temperature and begin checking the fish 3 minutes before the recommended finish time.
Cultural Context
This dish adapts the classic French beurre blanc technique, substituting a traditional white wine reduction with bright, sweet-tart tangerine juice. Citrus and mild white fish are a historic pairing heavily utilized across Mediterranean and coastal European cuisines, prized because the acidic punch cuts cleanly through the rich, flaky protein. Utilizing an oven-roast technique modernizes the preparation, yielding an elegant yet surprisingly straightforward dinner.
