Blackened Cod Fish Tacos with Creamy Lime Sauce

Name: Blackened Cod Fish Tacos with Creamy Lime Sauce
Ingredients: ½ cup white vinegar; 1 tablespoon honey; 2 teaspoons kosher salt, (divided); ½ red onion, (thinly sliced); 1 tablespoon paprika*; 2 teaspoons ground cumin; 2 teaspoons dried Mexican oregano ((marjoram or regular dried oregano also work)); 1 teaspoon ground black pepper; ¼ –½ teaspoon cayenne pepper; 4 (4-ounce) cod fillets ((halibut or mahi-mahi also work well)); 2 tablespoons extra-virgin olive oil; ¼ cup mayonnaise; ¼ cup Greek yogurt; 1 lime, (juiced and zested); ½ teaspoon paprika; 4 –8 (6-inch) corn or flour tortillas; 2 cups arugula; 1 cup canned black beans, (drained and rinsed); Lime wedges; Cilantro