Halibut or Mahi Mahi Baked in Fresh Green Salsa

The first time I tasted a dish like this, I was backpacking through Baja California. A tiny seaside taqueria, barely more than a shack, served the most vibrant green salsa I’d ever seen, spooned over grilled white fish. The tang of the tomatillos, the gentle heat of the peppers, and the brightness of the cilantro just sang of sunshine and the sea. I’ve been chasing that flavor ever since, and this recipe is my best attempt to bring that memory back to life.

Recipe Overview

• Prep Time: 15 minutes
• Cook Time: 15-20 minutes
• Total Time: 30-35 minutes
• Servings: 6
• Yield: 6 servings
• Dietary Type: Gluten-Free, Dairy-Optional

Ingredients

• 1 tablespoon butter
• 2 tablespoons flour
• ¾ cup tomatillos, coarsely chopped (green tomatoes)
• ½ cup onion, coarsely chopped
• 2 poblano peppers, coarsely chopped (or substitute with jalapenos for more heat)
• ¼ cup fresh cilantro, packed coarsely chopped, plus 2 tablespoons cilantro leaves for garnish
• ½ cup reduced-sodium chicken broth
• ¾ cup sour cream, divided (Light sour cream can be used)
• Kosher salt to taste
• 1 tablespoon lime juice
• 1 ¾ lbs halibut fillets (about 1 inch thick) or 1 ¾ lbs mahi mahi fillets (about 1 inch thick)

Equipment Needed

• Large frying pan
• Blender
• 8×12 inch baking dish
• Paper towels

Instructions

1. Preheat your oven to 375°F (190°C). Make sure the rack is positioned in the center of the oven for even baking.
2. In a large frying pan, melt the butter over high heat. Use a pan large enough to comfortably hold the green salsa later.
3. Stir in the flour and immediately remove the pan from the heat. Whisk the butter and flour together vigorously until a smooth paste, or roux, forms. This will help thicken the salsa.
4. Carefully scrape the flour paste into a blender. Be careful when transferring the hot mixture.
5. Add the coarsely chopped tomatillos, onion, poblano peppers (or jalapenos if substituting), chopped cilantro, and reduced-sodium chicken broth to the blender.
6. Puree the ingredients in the blender until completely smooth. Pulse a few times at the beginning to prevent splattering, then blend continuously.
7. Pour the green sauce back into the frying pan. Season with kosher salt and lime juice to taste. Bring the sauce to a boil over medium heat, stirring constantly to prevent sticking.
8. Rinse the halibut or mahi mahi fillets under cold water and pat them dry thoroughly with paper towels. This helps the fish to bake rather than steam.
9. Cut the fish fillets into 6 equal pieces, if necessary, ensuring they are roughly the same size for even cooking. Season the pieces generously with salt on both sides.
10. Set the seasoned fish pieces slightly apart in an 8 by 12 inch baking dish. This allows the hot air to circulate around each piece.
11. Pour the green sauce evenly over the fish fillets in the baking dish, ensuring each piece is well coated.
12. Bake the fish in the preheated oven until it flakes easily with a fork but still looks moist in the center of the thickest part. To check for doneness, gently insert a fork into the thickest part of a fillet and twist slightly. If the fish separates easily into flakes and appears opaque, it is done. This should take approximately 15 to 20 minutes, depending on the thickness of the fillets.
13. Serve the baked fish immediately. Spoon the green sauce generously over each portion. Top each serving with a small spoonful of the remaining sour cream and sprinkle with the fresh cilantro leaves for garnish.

Expert Tips & Tricks

• Spice Level: If you prefer a milder salsa, remove the seeds and membranes from the poblano peppers before chopping. For a hotter salsa, use serrano peppers instead of jalapenos.
• Thickening the Sauce: If the green salsa is too thin, simmer it in the frying pan for a few minutes longer after blending, stirring constantly, to allow it to thicken slightly.
• Fish Freshness: Use the freshest fish possible for the best flavor and texture. Look for fillets that are firm, have a fresh, clean smell, and are not discolored.
• Make-Ahead Tip: The green salsa can be made ahead of time and stored in the refrigerator for up to 2 days. Bring it to room temperature before pouring it over the fish.
• Even Cooking: For even cooking, ensure the fish fillets are of uniform thickness. If necessary, gently pound thicker portions with a meat mallet to achieve an even thickness.

Serving & Storage Suggestions

Serve the baked halibut or mahi mahi immediately after cooking. The vibrant green salsa complements the delicate flavor of the fish beautifully. Serve with a side of rice, quinoa, or roasted vegetables. Consider adding some warm tortillas for scooping up the delicious sauce.

Leftovers can be stored in an airtight container in the refrigerator for up to 2 days. To reheat, gently warm the fish in a preheated oven at 300°F (150°C) until heated through, or microwave on low power in short intervals to avoid overcooking. The sauce may separate slightly upon reheating but will still taste delicious. Freezing is not recommended as the texture of the fish and sauce may be compromised.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	264 kcal	N/A
Total Fat	11.8g	18%
Saturated Fat	5.5g	27%
Cholesterol	60.1mg	20%
Sodium	109.8mg	4%
Total Carbohydrate	8.9g	2%
Dietary Fiber	1.8g	7%
Sugars	1.4g	5%
Protein	30.1g	60%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

• Dairy-Free: Substitute the sour cream with a plant-based alternative such as cashew cream or coconut cream. Be sure to choose an unsweetened variety.
• Fish Options: If you can’t find halibut or mahi mahi, try using cod, sea bass, or snapper. Adjust cooking time as needed based on the thickness of the fillets.
• Vegetarian Option: Use firm tofu steaks instead of fish. Press the tofu to remove excess water, season with salt, and bake with the green salsa.
• Spice It Up: Add a pinch of cayenne pepper or a dash of hot sauce to the green salsa for an extra kick.
• Herb Variations: Experiment with different herbs in the salsa, such as parsley or epazote, for a unique flavor profile.

FAQs (Frequently Asked Questions):

Q: Can I use frozen fish for this recipe?
A: Yes, you can use frozen fish. Be sure to thaw it completely before cooking and pat it dry with paper towels to remove excess moisture.

Q: How do I know when the fish is cooked through?
A: The fish is done when it flakes easily with a fork and is opaque throughout. The internal temperature should reach 145°F (63°C).

Q: Can I make this recipe in advance?
A: The green salsa can be made a day or two ahead of time and stored in the refrigerator. However, it’s best to cook the fish just before serving to ensure the best texture.

Q: Can I grill the fish instead of baking it?
A: Yes, you can grill the fish. Preheat your grill to medium heat and grill the fish for 3-4 minutes per side, or until cooked through. Baste with the green salsa during the last few minutes of grilling.

Q: What side dishes go well with this recipe?
A: Rice, quinoa, roasted vegetables, and warm tortillas are all great side dishes to serve with this baked fish. A simple salad with a lime vinaigrette would also complement the flavors nicely.

Final Thoughts

This Halibut or Mahi Mahi baked in fresh green salsa is a flavorful and healthy dish that is perfect for a weeknight meal or a special occasion. The vibrant green salsa adds a burst of freshness to the delicate fish, creating a truly memorable culinary experience. Don’t be afraid to experiment with different variations and substitutions to create your own unique twist on this recipe. And please, share your creations and feedback – I’m always eager to hear how you’ve made it your own! Consider pairing it with a crisp Sauvignon Blanc for a delightful summer meal.