Chef Marcus Samuelsson shares this taco recipe, saying it's the freshest fish you can find that works the best and that you need a very hot grill for optimum success. Put the spicy slaw on top of each taco.
Heat a grill or grill pan over medium-high. Clean and lightly oil hot grill. Combine fish, cilantro stems, and jalapenos. Coat with oil and season with salt and pepper. Grill fish and jalapenos until fish is opaque throughout and jalapenos are charred and tender, about 5 minutes per side.
In a medium bowl, combine tomatoes, cabbage, and onion. Seed and finely chop 2 grilled jalapenos and add to bowl. Season to taste with seasoning salt and lime juice. Flake fish and divide among tortillas. Top with slaw and serve with cilantro leaves; remaining grilled jalapeno, thinly sliced; more seasoning salt; lime wedges; and avocado.
Smoky Seasoning Salt Combine 1/4 cup coarse sea salt, 2 tablespoons grated lime zest, 2 teaspoons smoked paprika, and 1/4 teaspoon cayenne pepper.