Chile-Lime Mahi-Mahi Tacos

Steps

1. 1

   Toast and soak chiles

   • Place 3 guajillo chiles on a dry skillet over medium heat for about 1 minute per side, just until fragrant (don't scorch them or they'll taste bitter).
   • Remove the stems and seeds.
   • Transfer to a bowl and cover with ¾ cup (180 ml) hot water.
   • Let sit undisturbed for 5 minutes until completely soft and pliable.
   • Drain well and set aside.

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   Ready when: Chiles are deep red, pliable, and no longer brittle

   Tip: Under-toasting gives dull flavor; over-toasting makes them bitter. A light toast for 1 minute per side strikes the balance.

2. 2

   Blend chile-lime sauce

   • In a blender, combine the drained guajillo chiles, juice from 2 fresh limes (about 3 tablespoons / 45 ml), 3 tablespoons (45 ml) olive oil, 2 minced garlic cloves, 1 teaspoon (2 g) ground cumin, ½ teaspoon (3 g) kosher salt, and ¼ teaspoon (0.5 g) black pepper.
   • Blend on high speed for 1–2 minutes until completely smooth with no chile bits visible.
   • If too thick, add 1–2 tablespoons (15–30 ml) water and blend again.
   • The sauce should be pourable but not watery.

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   Ready when: Sauce is velvety, uniform, and deep reddish-brown

   Tip: Taste and adjust: add more lime juice for brightness or a pinch more salt for depth.

3. 3

   Season and marinate fish

   • Pat the 4 mahi-mahi fillets dry with paper towels—remove all surface moisture.
   • Place them in a shallow dish.
   • Brush both sides generously with the chile-lime sauce (you'll use about 5–6 tablespoons total), reserving the remaining sauce (about 3 tablespoons / 45 ml) for basting on the grill.
   • Season the fish with ¼ teaspoon (1.5 g) kosher salt and ⅛ teaspoon (0.25 g) black pepper.
   • Let sit at room temperature for 5–10 minutes while you heat the grill.

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   Ready when: Fish is evenly coated and glistening with sauce

   Tip: Don't marinate longer than 15 minutes or the lime juice will begin to cure the fish, changing its texture and firmness.

4. 4

   Heat and oil grill gratesOven 400°F / 205°C

   • Heat your grill or grill pan to medium-high heat (about 400°F / 200°C).
   • Once the grates are very hot (water should sizzle and dance on contact), carefully oil them: dip a folded paper towel in 1 tablespoon (15 ml) olive oil and use tongs to rub it across the grates in a few quick swipes.
   • This prevents the delicate fish from sticking.

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   Ready when: Grill is hot enough to sear; oil shimmers on the grates

   Tip: Use tongs when oiling—never reach bare-handed over a hot grill. Well-oiled grates are essential for fish that won't stick or break.

5. 5

   Cook mahi-mahi until opaque

   • Carefully place the 4 marinated mahi-mahi fillets on the hot grill with the skin-side up (if your fillets have skin).
   • Don't move them.
   • Let them cook undisturbed for 4–5 minutes so a flavorful golden crust develops.
   • Brush the tops (the exposed side) with the reserved chile-lime sauce.
   • Using a thin fish spatula, gently slide it under each fillet and flip only once.
   • Cook for another 3–4 minutes on the second side until the thickest part of each fillet registers 140°F (60°C) on an instant-read thermometer.
   • The flesh should be opaque and flake easily when pressed with a fork.

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   Ready when: Internal temperature reaches 140°F (60°C); flesh is opaque, not translucent

   Tip: Resist the urge to move the fish around—constant flipping prevents browning and causes it to break apart. A thin fish spatula is gentler on delicate fillets than a standard grill spatula.

6. 6

   Warm tortillas on grill

   • During the last 3–4 minutes while the fish finishes cooking, place your 8 flour tortillas directly on the cooler side of the grill or in a tortilla basket if you have one.
   • Heat for about 30 seconds per side until they're warm, pliable, and have light char marks.
   • Don't char them too aggressively or they'll become crispy and brittle.

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   Ready when: Tortillas are warm, flexible, and lightly spotted with char

   Tip: If your grill is too hot or has no cooler zone, place tortillas in foil and set them on the top rack or away from direct flames.

7. 7

   Build and serve tacos

   • Remove the grilled fish and warm tortillas from the heat.
   • Place each mahi-mahi fillet on two overlapping warm flour tortillas.
   • Top with a thin layer of thinly sliced white onion, a small handful of fresh cilantro leaves, and a generous squeeze of fresh lime juice.
   • Add a spoonful of crema if using (optional).
   • Serve immediately with lime wedges on the side so guests can add more brightness.

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   Ready when: Tacos are assembled and ready to eat

   Tip: Overlapping two tortillas prevents filling from leaking through the bottom. Have all toppings prepped and at the table so assembly is quick and fish stays warm.