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 - Pour oil into a deep skillet or pot to a depth of 2 inches. Heat over medium-high heat until it reaches 350°F.
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 for 3-4 minutes until golden brown and crispy. Remove with a slotted spoon and 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 fresh cilantro and serve with lime wedges on the side.