Keto Baked Salmon with Lemon and Butter

Seafood

May 6, 2026

A food blogger holding a baking dish filled with fresh Keto Baked Salmon with lemon slices and butter, presenting the finished dish in a bright kitchen setting.

Ingredients

  • Salmon: 16 oz (454g) salmon fillet, whole or portioned
  • Lemon: 1 whole fresh lemon (yielding approximately 0.25 cup or 2 oz (60g) of slices and juice)
  • Butter: 6 tbsp (3 oz / 85g) unsalted butter, divided
  • Olive Oil: 1 tbsp (0.5 oz / 15ml) extra-virgin olive oil
  • Sea Salt: 0.5 tsp (2.5g) coarse sea salt (or to taste)
  • Black Pepper: 0.25 tsp (0.5g) ground black pepper (or to taste)

Step-by-Step Instructions

  1. Grease a large-sized baking dish with 1 tbsp (0.5 oz / 15ml) of olive oil and preheat your oven to 400°F (200°C).
  2. Place the 16 oz (454g) salmon fillet on the baking dish, preferably skin-side down, and generously season with 0.5 tsp (2.5g) of sea salt and 0.25 tsp (0.5g) of ground black pepper.
  3. Thinly slice half of the lemon and place the slices evenly over the salmon. Cover the fish with 3 tbsp (1.5 oz / 42.5g) of the butter, cut into very thin slices.
  4. Bake on the middle rack for 25 to 30 minutes, or until the Keto Baked Salmon flakes easily with a fork and is entirely opaque.
  5. While the fish rests, heat the remaining 3 tbsp (1.5 oz / 42.5g) of butter in a small saucepan over moderate heat until it begins to bubble, then immediately remove from the heat and let it cool slightly.
  6. Gently squeeze the remaining half of the lemon to yield about 1 tbsp (0.5 oz / 15ml) of fresh lemon juice, and whisk it into the slightly cooled melted butter.
  7. Serve the hot Keto Baked Salmon immediately, drizzled with the prepared lemon butter sauce.

Nutritional Information (Per Serving)

  • Calories: 576
  • Total Fat: 46g
  • Total Carbohydrates: 1.3g
  • Protein: 31g

(Note: This recipe yields 3 servings. Macros are approximate and may vary slightly based on the specific brands of ingredients used.)

Pro Tips

  • Temper the Fish: For the most even bake, take your salmon out of the refrigerator about 15 to 20 minutes before cooking to let it come closer to room temperature. This prevents the edges from drying out before the center is cooked through.
  • Pat it Dry: Always pat your salmon fillets completely dry with a paper towel before seasoning. Removing excess surface moisture ensures the butter and seasonings adhere properly and prevents the fish from steaming instead of baking.
  • Use High-Quality Fats: Since this is a ketogenic recipe where fat is a primary energy source, use high-quality, grass-fed butter (like Kerrygold) and a robust extra-virgin olive oil. It makes a noticeable difference in the final flavor profile of the lemon butter sauce.
  • Watch the Internal Temperature: To avoid dry, chalky fish, use an instant-read meat thermometer. Pull the salmon from the oven when it hits an internal temperature of 135°F to 140°F in the thickest part; residual heat will carry it to a perfect 145°F as it rests.

Frequently Asked Questions (FAQ)

Can I use frozen salmon for this Keto Baked Salmon recipe? Yes, you can use frozen salmon fillets. However, for the best texture and flavor, thaw them completely in the refrigerator overnight. Be sure to thoroughly pat the thawed fish dry with paper towels to remove the extra water content before applying the butter and baking.

What are the best low-carb side dishes to serve with Keto Baked Salmon? Because this salmon is rich and buttery, it pairs beautifully with light, earthy, and low-carb vegetables. Roasted asparagus, garlic butter green beans, sautéed spinach, or a creamy cauliflower mash make excellent keto-friendly accompaniments.

How do I store and reheat leftover Keto Baked Salmon? Store any leftover salmon in an airtight container in the refrigerator for up to 3 days. To reheat without drying out the fish or making it rubbery, place the salmon in a covered baking dish with a tiny splash of water or extra butter, and warm it in a low oven at 275°F (135°C) for about 10-15 minutes until just heated through. Avoid the microwave if possible.

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