01 - In a bowl, toss cabbage, red onion, cilantro, lime juice, and a pinch of salt. Set aside to marinate while preparing other components.
02 - Combine avocado, sour cream, cilantro, lime juice, garlic, salt, and pepper in a blender or food processor. Blend until smooth and creamy. Taste and adjust seasoning as needed.
03 - In a bowl, mix flour, cornstarch, baking powder, salt, pepper, and paprika. Gradually whisk in the sparkling water until you have a smooth batter with no lumps.
04 - Heat oil in a deep skillet or pot over medium-high heat to 350°F. The oil should be deep enough to submerge the fish strips completely.
05 - Pat fish strips dry with paper towels. Dip each strip into the batter, letting excess drip off, and carefully place in the hot oil. Fry in batches without overcrowding until golden and crisp, about 3-4 minutes per batch. Drain on paper towels.
06 - Place a portion of fried fish in each warm tortilla. Top with slaw and a generous drizzle of avocado crema. Garnish with extra cilantro and serve with lime wedges on the side.