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Four blackened fish tacos with avocado sauce and cabbage on a white plate.
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5 from 3 votes

Blackened Fish Tacos with Avocado Sauce

Bring the coastal flavors into your home with these Blackened Fish Tacos! Spicy, Cajun-seasoned cod or mahi mahi is seared in a cast iron skillet, loaded into warm corn tortillas, and topped with a creamy avocado sauce and fresh cilantro for the most epic flavor combo.
Prep Time20 minutes
Cook Time10 minutes
Total Time30 minutes
Course: Dinner, lunch, Main Course
Cuisine: Cajun, Mexican
Servings: 8 tacos

Ingredients

Blackened Fish:

  • 1-1 ¼ lbs. cod mahi mahi, tilapia, or other white-fleshed fish
  • 2 Tbsp. butter or oil
  • 1 ½ Tbsp. Blackened seasoning homemade or store bought
  • 2 tsp. brown sugar or regular white sugar
  • ¾-1 tsp. salt to taste*

Avocado Sauce:

  • 1 large avocado peeled and pitted
  • ¼ cup sour cream Greek yogurt or dairy-free alternative
  • ¼ cup packed cilantro plus more for serving
  • 2 Tbsp. lime juice fresh
  • ½ tsp. salt to taste

Serving:

  • 8 corn tortillas
  • ½ cup red cabbage thinly shredded
  • ¼ cup queso fresco crumbled, optional
  • Green onions thinly sliced
  • Cilantro finely chopped
  • Limes

Instructions

  • Prep the Fish: If starting with one large filet of fish, cut into smaller 1-2” pieces. Combine blackened seasoning, brown sugar, and 1 teaspoon salt in a small bowl. Whisk to combine. Sprinkle seasoning over the top and bottom of the fish pieces and then pat into the filets so it sticks.
    1-1 ¼ lbs. cod, 1 ½ Tbsp. Blackened seasoning, 2 tsp. brown sugar, ¾-1 tsp. salt
  • Cook the Fish: Place butter into a large cast iron skillet over medium heat. Once melted, add fish to the skillet and cook for 6-8 minutes, flipping halfway through. If pieces are thicker than 1-inch, sear on the additional sides to ensure they are cooked through.
    2 Tbsp. butter
  • Make the Sauce: While fish is cooking, add the avocado sauce ingredients to a small food processor or blender. Process until completely smooth and thoroughly combined.
    1 large avocado, ¼ cup sour cream, ¼ cup packed cilantro, 2 Tbsp. lime juice, ½ tsp. salt
  • Build the Tacos: Serve blackened fish on toasted or lightly fried corn tortillas with avocado sauce, shredded cabbage, chopped cilantro, green onions, and queso fresco.
    8 corn tortillas, ½ cup red cabbage, ¼ cup queso fresco, Green onions, Cilantro, Limes

Video

Notes

*You may need to add more or less salt depending on whether the Cajun seasoning has any added in. If using this Cajun seasoning blend, you’ll want to add ¾ to 1 teaspoon of salt.
Prep-Ahead Instructions:
You can easily chop the topping ingredients and make the avocado sauce the day before.
Storage Directions:
These blackened fish tacos are best when all of the components are stored separately. The cooked fish will last for up to 2-3 days in an airtight container. Place the chopped and shredded topping ingredients in their own individual containers. Store the avocado sauce in an airtight container for up to 3-4 days. Freezing is not recommended as the texture of all of the ingredients will change upon thawing.
Recipe Tips
  • Same size. Ensure the fish filets are not too big and roughly similar sized so they cook consistently.
  • Be choosy. Go with a firm, flaky, white fish for the best results.
  • Pat away. Dabbing the seasoned fish with a paper towel will help the seasoning stick to it during cooking.
  • Pay attention. Don't overcook the fish or the texture will not be appealing.
  • Add some spice. If you want an even bigger kick than the blackened seasoning, sprinkle some chili powder on the fish before cooking.

Nutrition

Calories: 215kcal | Carbohydrates: 16g | Protein: 16g | Fat: 10g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 45mg | Sodium: 1145mg | Potassium: 500mg | Fiber: 3g | Sugar: 2g | Vitamin A: 331IU | Vitamin C: 8mg | Calcium: 70mg | Iron: 1mg