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Lay the mahi mahi on a platter. Scatter the chopped cilantro (coriander) and garlic over the fish, then drizzle with the olive oil.
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Gently massage the marinade into the fish and season with salt and pepper.
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Set aside to marinate for 30 minutes, or cover and refrigerate to marinate for up to 6 hours.
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To make the pico de gallo: Stir the tomatoes, onion, jalapeño chile, and cilantro in medium bowl.
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Season to taste with lemon juice and salt; set aside at room temperature while finishing the tacos.
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To make the tacos: Brush the grill grate with canola oil then place the fish on the grill.
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Cook until the fish is cooked through and opaque and golden brown with grill marks, about 3 minutes per side.
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Transfer the fish to a cutting board and let rest for 2 minutes.
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Warm the tortillas on the grill heated through. Transfer the tortillas to a clean towel to keep warm.
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Meanwhile, thinly slice the cabbage.
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Slice the fish into 1-inch strips.
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Divide the fish among the warm tortillas.
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Top with the cabbage, avocados, pico de gallo, and crema.
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Scatter the cilantro leaves over the tacos. Serve with the lime wedges.