Roasted Cod with Caramelized Onion and Thyme
Prep
15 mins
Cook
35 mins
Servings
4
Difficulty
Easy
This is one of my favorite weeknight dinners because it comes together in just fifty minutes without fussing over complicated techniques. The beauty of roasted cod lies in its delicate flavor and incredible health benefits, particularly its omega 3 fatty acids that support heart health. While the fish cooks, the onions transform into sweet, golden caramelized perfection, creating a savory base that needs no cream or heavy sauce. Fresh thyme and sage add aromatic depth, and a splash of balsamic vinegar brings everything into balance. Best of all, this dish uses simple pantry staples and affordable ingredients, making it perfect for any budget conscious home cook who still wants something elegant on the dinner table.
Ella x
Ingredients
- 4cod fillets(6 oz each, skin removed)
- 3 largeyellow onions(thinly sliced)
- 4 sprigsfresh thyme
- 12fresh sage leaves
- 4 tablespoonsextra virgin olive oil(divided)
- 3garlic cloves(minced)
- 2 tablespoonsbalsamic vinegar
- 1 teaspoonsea salt
- ½ teaspoonblack pepper
- 1lemon(cut into wedges)
- 59 mlvegetable broth
Detail level
Instructions
- 1
Preheat oven to 400°F (200°C). Heat 2 tablespoons of olive oil in a large oven-safe skillet over medium heat.
Tip: Use a skillet that can transition from stovetop to oven for easier cooking.
- 2
Add the sliced onions to the skillet and cook, stirring occasionally, for 8-10 minutes until they begin to soften and turn golden.
Tip: Don't rush this step; patient caramelization develops deeper, sweeter flavors.
- 3
Stir in the minced garlic and fresh thyme sprigs, cooking for another 2 minutes until fragrant.
- 4
Pour in the balsamic vinegar and vegetable broth, stirring to combine. Cook for 3 more minutes until slightly reduced, then remove thyme sprigs.
Tip: The liquid helps deglaze the pan and adds depth to the onions.
- 5
Push the caramelized onions to the sides of the skillet, creating a center space for the cod. Season cod fillets with salt and pepper on both sides.
- 6
Place cod fillets in the center of the skillet, nestling them among the onions. Drizzle with remaining 2 tablespoons of olive oil.
Tip: Arrange fillets with space between them for even cooking.
- 7
Transfer the skillet to the preheated oven and bake for 12-15 minutes until cod is opaque and flakes easily with a fork.
Tip: Cooking time depends on fillet thickness; don't overcook or the fish will dry out.
- 8
While cod roasts, heat a small skillet over medium-high heat. Add sage leaves and cook until crispy, about 1-2 minutes per side, then set aside on paper towels.
Tip: Crispy sage adds a wonderful textural and flavor contrast.
- 9
Remove skillet from oven and top each cod fillet with crispy sage leaves. Serve immediately with fresh lemon wedges on the side.
Tip: Squeeze fresh lemon juice over the dish just before eating for brightness.
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