01 - Toss cabbage, red onion, cilantro, lime juice, and a pinch of salt in a bowl. Set aside to allow flavors to meld.
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 - Mix flour, cornstarch, baking powder, salt, pepper, and paprika in a bowl. Gradually whisk in the sparkling water until smooth batter forms.
04 - Heat oil in a deep skillet or pot over medium-high heat to 350°F.
05 - Pat fish strips dry. Dip each strip into batter, allowing excess to drip off, and carefully place in hot oil. Fry in batches until golden and crisp, about 3-4 minutes per batch. Drain on paper towels.
06 - Place fried fish in each tortilla. Top with slaw and drizzle generously with avocado crema. Garnish with cilantro and serve with lime wedges.