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)