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. Taste and adjust seasoning as needed.
03 - Whisk together flour, cornstarch, baking powder, salt, pepper, and paprika in a mixing bowl. Gradually whisk in the sparkling water until smooth batter forms.
04 - Pour oil into a deep skillet or pot to reach 2-3 inches depth. Heat over medium-high heat until temperature reaches 350°F.
05 - Pat fish strips 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 with slaw and drizzle generously with avocado crema. Garnish with additional cilantro and serve with lime wedges on the side.