Halibut Fish Tacos with Cilantro Savoy Slaw

Name: Halibut Fish Tacos with Cilantro Savoy Slaw
Ingredients: 3 limes; 2 cloves garlic, quartered; 1 small bunch cilantro, leaves and tender stems (about 2 cups packed); 1 bunch scallions, half coarsely chopped and half finely chopped; 1 1/2 teaspoons ground cumin; Kosher salt; 1/4 cup extra-virgin olive oil; 1 pound skinless halibut fillets, cut into 1-inch chunks; 4 cups packed finely shredded savoy cabbage (about 8 ounces); 2/3 cup sour cream; 8 to 12 corn tortillas, warmed; Prepared salsa verde, for serving