01 - Toss cabbage, red onion, cilantro, lime juice, and a pinch of salt in a bowl. 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 completely smooth and creamy. Adjust seasoning as needed.
03 - Whisk together 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 until it reaches 350°F. The oil should be deep enough to submerge the fish strips.
05 - Pat fish strips dry with paper towels. Dip each strip into the batter, allowing excess to drip off, then carefully place in hot oil. Fry in batches for 3-4 minutes until golden and crisp. Drain on paper towels.
06 - Place fried fish in warm tortillas. Top generously with slaw and drizzle with avocado crema. Garnish with fresh cilantro and serve with lime wedges.