Fish Tacos with Cabbage Slaw and Pickled Red Onions

Name: Fish Tacos with Cabbage Slaw and Pickled Red Onions
Ingredients: 1/2 cup red wine vinegar; 2 tablespoons kosher salt, plus additional for seasoning; 1 tablespoon sugar; 2 to 3 shakes hot sauce, such as Tabasco; 1 red onion, sliced thinly; 2 tomatillos; 1 jalapeno; Juice from 1 lime, plus lime wedges for serving; 1 bunch fresh cilantro, stems removed and leaves roughly chopped; 1/4 green cabbage, thinly sliced; 1/4 red cabbage, thinly sliced; 1 carrot, grated; Olive oil, for drizzling; 4 mild, flaky, white fish fillets, like tilefish; 1/2 tablespoon smoked paprika; 8 corn tortillas; 1 avocado, thinly sliced; 1/2 cup Cotija, crumbled