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Simple & Delicious Keto Mahi Mahi Recipe 🐟

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Whether you fancy fish dishes or just seeking a novice-friendly cook-up, this Keto Mahi Mahi Recipe is the ultimate pick!

Keto mahi mahi recipe served with roasted asparagus.
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Preparation and cooking overview

With just a handful of ingredients and a hot skillet, you can whip up a healthy and delicious meal in 30 mins. The star of the show is the Mahi Mahi, a semi-mild and sweet-tasting fish. Season it with herbs and spices, and enjoy a crispy crust! 

Chef's note

The combination of chili and lime really brings out the best flavors in Mahi Mahi fish. However, you can adjust the spiciness according to your taste. One important thing to remember when cooking fish is to avoid overcooking it, as this can make it dry and hard to chew. Aim for a nice golden brown color, and check with a food thermometer to make sure it's cooked just right.

  • Prep Time: 5 minutes
  • Cooking Time: 15 minutes
  • Total Time: 20 Minutes
  • Difficulty Level: Easy
  • Recipe Makes 4 Servings
Mahi mahi dish garnished with lime.

🐟 Ingredients for this keto Mahi Mahi recipe recipe

Chili lime butter

  • ΒΌ cup refined coconut oil
  • 1 teaspoon chili powder
  • Zest from 2 limes
  • Pinch of salt

Keto pan-seared Mahi Mahi

  • 4 wild-caught Mahi Mahi fillets, thawed
  • 1 tablespoon coconut oil
  • Salt and pepper
Mahi mahi recipe.

Ingredient substitutions

  • Coconut oil: Substitute with ghee or butter if you're not avoiding dairy.
  • Chili powder: You can add cumin, paprika, and curry powder to your dish. These spices each have their own distinct flavors that can enhance the overall taste. Simply use the same quantity as specified in the original recipe.
  • Lime zest: No limes in the kitchen? No worries! You can substitute them with lemon zest or orange zest instead.
  • Mahi Mahi: If you can't find Mahi Mahi, you can buy cod or halibut as alternatives. Both cod and halibut are mild-flavored white meat fish. Also, keep in mind that the cooking time may vary slightly depending on the thickness of the fish fillets, so you'll need to adjust accordingly.

Additional ingredients

  • Fresh garlic cloves: Smash or chop the garlic to release its wonderful aroma.
  • Fresh herbs: Sprinkle some finely chopped herbs like parsley, cilantro, or dill over the pan-seared fillets just before serving. They'll give a burst of freshness.
  • Red pepper flakes: If you like it spicy, sprinkle some red pepper flakes over the fish or toss them into the chili lime buttery sauce.
  • Avocado: Slice or dice an avocado to add a creamy and nutritious touch to the dish. It makes a great topping.
  • Chopped tomatoes: Dice some fresh tomatoes to bring in a touch of freshness and a hint of tanginess that complements the dish.
Close up shot of pan seared mahi mahi fillet garnished with lime slice.

Cooking tools required

To make this Keto Mahi Mahi recipe, you'll need the following tools:

  • Small bowl
  • Whisk
  • Cast iron skillet
  • Kitchen thermometer (optional)
  • Spatula or tongs

Tool substitutes list

  • Whisk: Don't have a whisk? No worries! You can easily replace it with a fork, spoon, or spatula to achieve a smooth consistency for the butter.
  • Cast iron skillet: If you don't have a cast iron skillet, no problem! A non-stick skillet or a regular frying pan will work just as well. Just keep in mind the heat conductivity of the material.
  • Thermometer: No thermometer? No sweat! You can still check if the fish is done by gently pressing the flesh with a fork or your finger. It should feel firm, look opaque, and easily flake when tested with a fork.
  • Spatula or tongs: Don't have a spatula or tongs? No biggie! You can use any kitchen utensil that can flip and transfer the fillets. A fork, a large spoon, or even skillfully maneuvering with a pair of chopsticks can do the trick.
Mahi mahi recipe.

How to make Keto Mahi Mahi Recipe: step-by-step guide

Cooking methods

  • Pan-searing

Preparation steps

  1. Gather up all the ingredients and kitchen tools you'll need.
  2. Take the time to measure the ingredients and set them aside.
  3. Grab a sharp knife and use it to cut the fish into individual fillets of similar thickness. Then, season them with some salt and pepper.

Cooking instructions

  1. Prepare chili lime butter: In a small bowl, mix together the refined coconut oil, chili powder, and zest. Stir them well until they are nicely combined, and set the mixture aside.
  2. Pan sear Mahi Mahi: Get your cast iron skillet ready by preheating it over medium heat for about 5 minutes. Once it's hot, melt the coconut oil in the skillet and add the seasoned fish fillets. Cook each side for approximately 6 minutes until they turn a lovely golden brown and are fully cooked, reaching an internal temperature of 145Β°F (62Β°C).
  3. Serve: Transfer the cooked fish fillets to a plate, and to make it even more flavorful, add a tablespoon of chili lime butter on top. Enjoy this delicious chili lime Mahi Mahi while it's still warm, and don't forget to squeeze some lime wedges over it for an extra zing!
Adding lime zest to a mixture of refined coconut oil, chilli powder, and salt.
Mixing ingredients with sooden spatula in a bowl.
Mahi mahi fillets seasoned with salt and pepper placed on paper napkins.
Cooking keto mahi mahi in a cast iron dish.
Garnishing keto mahi mahi fillets recipe with chilli lime butter sauce.

Chef's pro tip


To ensure that this Keto Mahi Mahi turns out perfect, it's crucial to fry the fish correctly. Even if you've seasoned it to perfection, what if it starts sticking to the pan? We've all been there, and if you rush it, the fillets can easily crumble into bits. Trust us!

So, make sure to heat your skillet properly before adding the oil. Place a few fillets in the pan, making sure not to overcrowd it, and let them soak in the oil. This not only helps in making the fish juicy and firm but also creates a delicious crust. And here's a golden rule of cooking fish – don't fuss with it! Let it sear undisturbed. Voila! The crust will naturally release itself from the pan when it's ready to flip.

What to serve with Mahi Mahi?

This Keto Mahi Mahi tastes even better when you have it with other keto-friendly veggies and dishes. While it's delicious on its own, combining it with other foods adds an extra level of enjoyment. Take a look at these keto options:

  • Cauliflower rice: This alternative to traditional rice can help you create a satisfying quick dinner with low carbs.
  • Roasted or grilled vegetables: Pair this recipe with roasted zucchini, asparagus, or broccoli for a well-rounded grub.
  • Steamed or sautΓ©ed greens: Serve with spinach, green beans, or kale to bring the dish a nutritious and vibrant element.
  • Side salad: Enjoy it with mixed greens and vegetables dressed with a simple vinaigrette.
  • Lime wedges: If you want to keep it simple, just serve with some lime wedges and enjoy the tangy flavors of this great fish dinner.
Mahi mahi recipe topped with lime slices on kitchen table.

How to make it healthier

If you want to make some changes to support your healthy diet goals, here are a few suggestions to consider!

  • Reduce oil quantity: Lower the amount of oil used in the recipe by using a non-stick pan and only adding a small amount of oil to the pan. Alternatively, try spraying or brushing the pan with some oil.
  • Reduce sodium intake: To reduce the amount of sodium in the dish, use low-sodium salt and seasonings such as herbs and spices.

Time-saving tips

  • To make things easier, you can buy pre-made fillets instead of preparing them yourself.
  • Opt for a non-stick pan since it heats up fast and requires less oil for cooking. This not only saves time but also makes cleaning up a breeze.
  • If you're cooking a big bunch of fish fillets, it's best to cook them in batches. This way, you avoid overcrowding the pan, which can cause uneven cooking and sticking.
Pan-Seared fish dish served with asparagus on a plate.

What can I prepare ahead of time?

  • Chili lime butter: Prepare the butter condiment and store it in the refrigerator until you cook the fish.
  • Thaw the fillets: If you're using frozen fish, thaw them in the refrigerator for hours before frying them.

Storage and reheating instructions

To store leftovers, first, allow them to cool down to room temperature. Then, wrap them tightly with plastic wrap or store them in an airtight container and refrigerate for 3-4 days.

You can reheat them quickly by following practices:

  • Oven: To reheat the leftovers, preheat the oven to 350Β°F (175Β°C). Place the leftovers on a baking sheet and cover them with aluminum foil. Bake for about 10 minutes or until the fish is thoroughly heated.
  • Microwave: To reheat the leftovers, transfer them to a microwave-safe dish and cover it with a lid. Heat on high for 1-2 minutes or until it is thoroughly heated.
  • Stovetop: Heat a non-stick skillet over medium heat and add a small amount of oil or butter to the pan. Once the oil is heated, add the leftovers and cook them for a few minutes on each side until they are heated through.
Mahi mahi dish garnished with lime served with roasted asparagus.

Recipe wrap-up & conclusion


This Keto Mahi Mahi Recipe is here to satisfy your seafood cravings without derailing your keto routine. It's simple to make, and you don't need to be an expert chef to try this one out!

So grab your trusty skillet and get ready to indulge in the fantastic blend of flavors. The tangy and creamy chili-lime butter melts over the perfectly golden brown pan-seared Mahi Mahi, making this dish really nutritious!

For more inspiration, check out our other quick and easy keto fish recipes:

Keto fish dish with lime garnish.

Frequently asked questions

If you prefer a milder flavor, lower the chili powder amount in the butter or omit it altogether. Alternatively, put a pinch of cayenne pepper or red pepper flakes to bring up the spiciness.

While cooking times can vary depending on the thickness of the fillets, a good indication that the fish is cooked through is when it easily flakes with a fork and turn opaque.

While lime zest provides a more concentrated and aromatic lime flavor, you can substitute it with freshly squeezed lime juice. Remember that the flavor may differ slightly, as the zest contains essential oils contributing to its unique taste.

Marinate the fish with salt, pepper, and citrus juices. Leave it for 20-30 minutes, allowing the flavors to penetrate the fish. If you have time, you can also leave it for a few hours or overnight if you plan to enjoy it tomorrow. The fillets are just going to be filled with all the juices and flavors.

Of course! You can bake or grill the fillets. Each method will offer a slightly different texture and taste profile. Adjust the cooking time and steps per chosen method and ensure the fish is cooked through before serving.

Yes! If you prefer a dairy-free option, substitute it with a plant-based alternative like vegan butter or coconut oil. This substitution will slightly alter the taste and texture of the butter.

πŸ“– Recipe

Keto Mahi Mahi Recipe garnished with the slices of lime.

Keto Mahi Mahi Recipe

This Keto Mahi Mahi Recipe is a quick, flavorful, and high-protein seafood dish featuring pan-seared Mahi Mahi fillets served with a zesty chili lime butter.
5 from 1 vote
Print Rate Pin Recipe
Course: Main Course
Cuisine: Fusion
Keyword: keto fish recipe
Prep Time: 5 minutes
Cook Time: 15 minutes
Total Time: 20 minutes
Servings: 2
Calories: 577kcal

Ingredients

Chili lime butter

  • ΒΌ cup refined coconut oil
  • 1 teaspoon chili powder
  • Zest from 2 limes
  • Pinch of salt

Keto pan-seared Mahi Mahi

  • 4 wild-caught Mahi Mahi fillets thawed
  • 1 tablespoon coconut oil
  • Salt and pepper

Instructions

  • Prepare chili lime butter: Mix the refined coconut oil, chili powder, and zest in a small bowl. Stir them until they are well combined, and set aside.
  • Pan sear Mahi Mahi: Preheat a cast iron skillet over medium heat for 5 minutes. Melt the coconut oil there and add the seasoned fish fillets. Cook each side for about 6 minutes until they are golden brown and fully cooked with an internal temperature of 145Β°F (62Β°C).
  • Serve: Transfer the cooked fish fillets to a plate and add a tablespoon of chili lime butte to savor this delicious chili lime mahi mahi. Serve it warm with lime wedges and enjoy!

Video

Nutrition

Nutrition Facts
Keto Mahi Mahi Recipe
Amount Per Serving
Calories 577 Calories from Fat 324
% Daily Value*
Fat 36g55%
Saturated Fat 29g181%
Polyunsaturated Fat 1g
Monounsaturated Fat 3g
Cholesterol 248mg83%
Sodium 316mg14%
Potassium 1434mg41%
Carbohydrates 1g0%
Fiber 0.3g1%
Sugar 0.1g0%
Protein 63g126%
Vitamin A 909IU18%
Vitamin C 0.01mg0%
Calcium 55mg6%
Iron 4mg22%
*

Nutritional values are estimates only and do not include carbs from sugar alcohols.

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