Oven-Roasted Barramundi with Lemon Myrtle and Garlic Butter

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A delicate Australian barramundi fillet roasted to flaky perfection with native lemon myrtle and a rich garlic butter sauce. This australian-inspired seafood ready in about 25 minutes pairs fillets (6 oz each) barramundi fillets, unsalted butter, minced garlic cloves for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 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.

Prep: 10 min Cook: 15 min Serves 4 Australian cuisine 320 cal/serving
Plan a meal with the AI → Order on Instacart →

Ingredients

Instructions

  1. Step 1: Preheat oven to 400°F (200°C). Pat dry 4 barramundi fillets and place them skin-side down on a lightly oiled baking dish using 1 tbsp olive oil.
  2. Step 2: In a small saucepan over medium heat, melt 4 tbsp unsalted butter. Add 4 minced garlic cloves and 2 tbsp finely chopped fresh lemon myrtle leaves, cooking for 2 minutes until fragrant but not browned.
  3. Step 3: Remove the butter from heat and stir in 2 tbsp lemon juice, 1 tsp salt, and 1/2 tsp black pepper.
  4. Step 4: Pour the garlic lemon myrtle butter evenly over the barramundi fillets.
  5. Step 5: Roast in the preheated oven for 12-15 minutes until the fish flakes easily with a fork and is opaque throughout.
  6. Step 6: Garnish with 2 tbsp chopped fresh parsley before serving with steamed green vegetables or a fresh salad.

Frequently asked questions

How long does Oven-Roasted Barramundi with Lemon Myrtle and Garlic Butter take to make?

Total time is about 25 minutes (10 min prep + 15 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 Oven-Roasted Barramundi with Lemon Myrtle and Garlic 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 Oven-Roasted Barramundi with Lemon Myrtle and Garlic 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 Oven-Roasted Barramundi with Lemon Myrtle and Garlic 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 Oven-Roasted Barramundi with Lemon Myrtle and Garlic Butter?

Australian 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.

Related recipes

Equipment for this recipe

Top-rated tools to make this recipe successfully.

More Bakeware & baking tools → Shop all kitchen tools →