Fish Taco Bowls with Green Cabbage Slaw

Name: Fish Taco Bowls with Green Cabbage Slaw
Ingredients: 1 cup packed baby spinach; 1 small jalapeño pepper, roughly chopped; 1 small shallot, roughly chopped; 1 anchovy fillet; 2 tablespoons water; 1 cup packed fresh cilantro leaves, divided, plus more for garnish; ¼ cup fresh lime juice, divided, plus lime wedges for serving; ¾ teaspoon salt, divided; 2 cups finely shredded green cabbage; 1 (1 1/2 pound) skinless halibut fillet; 2 tablespoons extra-virgin olive oil; ½ teaspoon ground pepper; 2 cups hot cooked long-grain brown rice; 2 medium avocados, thinly sliced