Sizzling Turmeric-Dill Fish Tacos

Name: Sizzling Turmeric-Dill Fish Tacos
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 2 Tbsp. fresh lime juice; 1 Tbsp. plus 1 tsp. fish sauce; 2 tsp. sugar; 2 medium tomatoes, chopped; 1 small red onion, finely chopped; 1 Fresno or serrano chile, seeds removed, finely chopped; 2 garlic cloves, finely chopped; ¼ cup finely chopped cilantro; Kosher salt; 1 garlic clove, finely chopped; 1 2" piece ginger, peeled, finely grated; 1½ tsp. Diamond Crystal or 1 tsp. Morton kosher salt; 1 tsp. ground turmeric; 5 Tbsp. vegetable oil, divided; Freshly ground black pepper; 1½ lb. skinless, boneless cod or halibut fillets, cut into 2" pieces; 1 bunch scallions, dark green parts only, cut into 2" lengths; ½ bunch dill, tough stems removed, coarsely chopped; 12 corn tortillas, warmed; Shredded red cabbage, thinly sliced Fresno or serrano chiles, chopped cilantro, crushed salted dry-roasted peanuts, and lime wedges (for serving)