Chipotle Crema- Whisk together the sour cream, chipotle puree, and 1/4 teaspoon salt in a small bowl. Refrigerate for at least 15 minutes or up to 1 day before serving.

Fish- Light one chimney full of charcoal. When all the charcoal is lit and covered with gray ash, pour out and spread the coals evenly over entire surface of coal grate. Set cooking grate in place, cover gill and allow to preheat for 5 minutes. Clean and oil the grilling grate. Brush the fish on both sides with the oil and season with the ancho powder and salt. Place the fillets on the grill over medium-high heat and cook until golden brown and slightly charred, 3 to 4 minutes. Using a spatula, turn the fish over and continue grilling until just cooked through, 3 to 4 minutes longer. Remove the fish and let rest for 5 minutes before shredding into bite-sized pieces.

While the fish is resting, wrap the tortillas in foil and place on the grill for 5 minutes to warm through.

Lay the warm tortillas on a flat surface and drizzle with some of the chipotle crema. Top with fish, cabbage, onion, cilantro, and salsa. Fold and eat with a squeeze of lime juice.