01 - Combine shredded cabbage, red onion, cilantro, lime juice, and a pinch of salt in a bowl. Toss thoroughly to mix and set aside to marinate.
02 - Place avocado, sour cream, cilantro, lime juice, garlic, salt, and pepper in a blender or food processor. Blend until completely smooth and creamy. Adjust seasoning to taste.
03 - Whisk together flour, cornstarch, baking powder, salt, pepper, and paprika in a mixing bowl. Gradually pour in cold sparkling water while whisking until batter reaches smooth consistency.
04 - Pour oil into a deep skillet or pot and heat over medium-high heat until it reaches 350°F.
05 - Pat fish strips completely dry with paper towels. Dip each strip into batter, allowing excess to drip off, then carefully place in hot oil. Fry in batches for 3-4 minutes until golden brown and crispy. Remove and drain on paper towels.
06 - Place a portion of fried fish in each warmed tortilla. Top generously with slaw and drizzle with avocado crema. Garnish with additional cilantro and serve with lime wedges on the side.