Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter
Delicate cod fillets slow-roasted and finished with a bright citrus and seaweed-infused butter, evoking flavors inspired by the Southern Ocean surrounding Antarctica. This mediterranean-inspired seafood ready in about 35 minutes pairs fillets (6 oz each) cod fillets, unsalted butter, dried seaweed flakes for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 4 fillets (6 oz each) cod fillets
- 4 tbsp unsalted butter
- 1 tbsp dried seaweed flakes
- 1 tsp lemon zest
- 1 tsp orange zest
- 2 tbsp fresh lemon juice
- 2 cloves, minced garlic cloves
- 2 tbsp olive oil
- 1 tsp salt
- 1/2 tsp black pepper
- 2 tbsp chopped fresh parsley
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Instructions
- Step 1: Preheat oven to 275°F (135°C). Pat dry 4 cod fillets (6 oz each) and season both sides with 1 tsp salt and 1/2 tsp black pepper.
- Step 2: In a small saucepan over low heat, melt 4 tbsp unsalted butter. Stir in 1 tbsp dried seaweed flakes, 1 tsp lemon zest, and 1 tsp orange zest. Remove from heat and whisk in 2 tbsp fresh lemon juice and 2 minced garlic cloves until combined.
- Step 3: Place cod fillets on a parchment-lined baking sheet and brush generously with half of the citrus seaweed butter mixture. Roast for 20-25 minutes, until the fish flakes easily with a fork and is opaque.
- Step 4: Remove cod from oven and spoon remaining butter over each fillet. Drizzle 2 tbsp olive oil evenly over the fish and sprinkle with 2 tbsp chopped fresh parsley. Serve immediately.
Frequently asked questions
How long does Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter take to make?
Total time is about 35 minutes (10 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep unsalted butter from drying out.
Can I substitute ingredients in Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Slow-Roasted Antarctic Cod with Citrus and Seaweed Butter?
Mediterranean seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
