Keto salmon with lemon butter sauce is the dinner I’d point anyone toward when they say they don’t have time to cook. One skillet, about 20 minutes, and a pan sauce that tastes like it came from a good restaurant.
Each fillet with its sauce comes to 2 g net carbs, 34 g of protein, and about 381 calories, calculated from the ingredients below. It’s naturally low carb, so there’s nothing to substitute.
Salmon and butter are both calorie-dense, which is great for staying full but easy to overdo. My free calorie calculator shows you a realistic daily range so you can fit rich meals like this in with confidence.
- 2 g net carbs and 34 g protein per fillet with sauce, about 381 calories.
- Dry fish sears; wet fish steams. Pat the fillets completely dry before they hit the pan.
- Don’t move the salmon for the first 4 minutes. It releases on its own when the crust forms.
- Cold butter, low heat is the secret to a sauce that stays glossy instead of greasy.
- Pull it at 125 to 130°F for moist, just-flaky salmon.
Why This Works on Keto
Salmon is one of the easiest proteins to fit into keto. It has zero carbs, a solid amount of protein, and a good share of omega-3 fats, the kind many people don’t get enough of when they eat mostly beef and chicken.
The lemon butter sauce adds fat and flavor with only a trace of carbs from the lemon and garlic. That’s the kind of trade keto rewards: more satisfaction, no blood sugar spike.
Speed matters for consistency. A lot of people fall off a new eating plan on nights when cooking feels like a project. Having a fast, reliable dinner in your back pocket makes those nights a non-event.
A Few Notes on the Ingredients
Salmon fillets of even thickness, about 6 ounces each, cook most evenly. Skin-on gives you a crisp side and protects the flesh from overcooking. Wild salmon is leaner, so pull it a minute earlier.
Butter should go into the sauce cold and in pieces. Swirling it into a warm, not hot, pan keeps it creamy. If it separates, you had the heat too high.
Lemon juice should be fresh. Bottled juice tastes flat in a sauce this simple. Add a little zest for extra aroma without extra sourness.
Chicken broth helps loosen the browned bits from the pan and gives the sauce body. Dry white wine works too, but a splash of broth keeps it family-friendly.
Keto Salmon With Lemon Butter Sauce
Ingredients
Equipment
Method
- Cut the salmon into 4 even fillets. Pat completely dry with paper towels and season both sides with the salt and pepper.
- Heat the avocado oil in a large skillet over medium-high heat until it shimmers. Add the salmon skin side up (or presentation side down) and sear without moving for 4 minutes, until a golden crust forms.
- Flip the fillets and cook 2 to 4 minutes more, until the thickest part reaches 125 to 130°F. Move the salmon to a plate.
- Lower the heat to medium-low. Add the minced garlic and cook 30 seconds, until fragrant.
- Pour in the chicken broth and lemon juice and scrape up the browned bits. Simmer about 2 minutes, until reduced by about half.
- Take the skillet off the heat. Add the cold butter in pieces and swirl until melted and glossy. Stir in the lemon zest and chopped dill, and taste for salt.
- Return the salmon to the pan, spoon the sauce over the top, and serve right away.
Nutrition
Notes
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- Dairy free: Use ghee or a good olive oil instead of butter and finish with extra lemon zest.
- Creamier sauce: Add 2 tablespoons of heavy cream with the broth for a lemon cream version.
- Swap the fish: Cod, halibut, or scallops work with the same sauce. Adjust the sear time for thinner pieces.
- Add capers: A tablespoon of rinsed capers gives the sauce a briny, piccata-style edge.
- Herb switch: Trade dill for parsley, chives, or tarragon.
Storage, Leftovers, and Serving
Salmon is best fresh, but leftovers keep in a sealed container in the fridge for up to 2 days. Store the sauce separately if you can, because it firms up when cold.
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Reheat gently: warm the salmon covered at 275°F for about 10 minutes, and melt the sauce in a small pan over low heat. Or skip reheating and flake cold salmon over a green salad.
Serve with roasted asparagus, sautéed spinach, or cauliflower mash. For more quick weeknight options, see my keto dinner recipes.
Where I shop
Where I Buy My Pantry Staples
Thrive Market is the online grocery membership I use for pantry staples. It is handy for the oils, nuts, seeds, spices and gluten-free basics that recipes like this one call for, delivered to your door.
Get 40% off your first order →Referral link: new members get 40% off their first order (up to $30), and Thrive Market gives me store credit if you join. I only recommend products I use myself or recommend to my clients.
Frequently Asked Questions
Is Salmon Good for a Keto Diet?
Yes. Salmon has no carbs and provides quality protein and omega-3 fats. This recipe comes in at about 2 g net carbs, 34 g protein, and 26 g fat per serving, with almost all the carbs coming from the lemon and garlic.
Why Does My Salmon Stick to the Pan?
Usually the pan wasn’t hot enough, the fish was wet, or it was moved too soon. Heat the oil until it shimmers, pat the fillets dry, and leave them alone until the crust releases naturally, about 4 minutes.
Why Did My Butter Sauce Separate?
The pan was too hot. Butter sauces break when the milk solids and fat separate from heat. Take the skillet off the burner, add the butter in cold pieces, and swirl. A teaspoon of warm broth can bring a broken sauce back together.
Your This-Week Plan
Here’s the experiment: pick your two most hectic weeknights and make this salmon on one of them. Time yourself from fridge to plate. Once you know a great dinner takes 20 minutes, the excuse that you don’t have time to cook tends to disappear.
This recipe is for general education, not medical advice. Nutrition values are estimates and will vary with brands. If you’re pregnant, have a health condition, or take medication for blood sugar or blood pressure, check with your doctor before starting keto.
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